| /* vi: set sw=4 ts=4: */ |
| /* |
| * lash -- the BusyBox Lame-Ass SHell |
| * |
| * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| * |
| * Based in part on ladsh.c by Michael K. Johnson and Erik W. Troan, which is |
| * under the following liberal license: "We have placed this source code in the |
| * public domain. Use it in any project, free or commercial." |
| * |
| * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
| */ |
| |
| /* This shell's parsing engine is officially at a dead-end. Future |
| * work shell work should be done using hush, msh, or ash. This is |
| * still a very useful, small shell -- it just don't need any more |
| * features beyond what it already has... |
| */ |
| |
| //For debugging/development on the shell only... |
| //#define DEBUG_SHELL |
| |
| #include <getopt.h> |
| #include <glob.h> |
| |
| #include "libbb.h" |
| |
| #define expand_t glob_t |
| |
| /* Always enable for the moment... */ |
| #define CONFIG_LASH_PIPE_N_REDIRECTS |
| #define CONFIG_LASH_JOB_CONTROL |
| #define ENABLE_LASH_PIPE_N_REDIRECTS 1 |
| #define ENABLE_LASH_JOB_CONTROL 1 |
| |
| |
| enum { MAX_READ = 128 }; /* size of input buffer for 'read' builtin */ |
| #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" |
| |
| |
| #if ENABLE_LASH_PIPE_N_REDIRECTS |
| enum redir_type { REDIRECT_INPUT, REDIRECT_OVERWRITE, |
| REDIRECT_APPEND |
| }; |
| #endif |
| |
| enum { |
| DEFAULT_CONTEXT = 0x1, |
| IF_TRUE_CONTEXT = 0x2, |
| IF_FALSE_CONTEXT = 0x4, |
| THEN_EXP_CONTEXT = 0x8, |
| ELSE_EXP_CONTEXT = 0x10 |
| }; |
| |
| #define LASH_OPT_DONE (1) |
| #define LASH_OPT_SAW_QUOTE (2) |
| |
| #if ENABLE_LASH_PIPE_N_REDIRECTS |
| struct redir_struct { |
| enum redir_type type; /* type of redirection */ |
| int fd; /* file descriptor being redirected */ |
| char *filename; /* file to redirect fd to */ |
| }; |
| #endif |
| |
| struct child_prog { |
| pid_t pid; /* 0 if exited */ |
| char **argv; /* program name and arguments */ |
| int num_redirects; /* elements in redirection array */ |
| int is_stopped; /* is the program currently running? */ |
| struct job *family; /* pointer back to the child's parent job */ |
| #if ENABLE_LASH_PIPE_N_REDIRECTS |
| struct redir_struct *redirects; /* I/O redirects */ |
| #endif |
| }; |
| |
| struct jobset { |
| struct job *head; /* head of list of running jobs */ |
| struct job *fg; /* current foreground job */ |
| }; |
| |
| struct job { |
| int jobid; /* job number */ |
| int num_progs; /* total number of programs in job */ |
| int running_progs; /* number of programs running */ |
| char *text; /* name of job */ |
| char *cmdbuf; /* buffer various argv's point into */ |
| pid_t pgrp; /* process group ID for the job */ |
| struct child_prog *progs; /* array of programs in job */ |
| struct job *next; /* to track background commands */ |
| int stopped_progs; /* number of programs alive, but stopped */ |
| unsigned int job_context; /* bitmask defining current context */ |
| struct jobset *job_list; |
| }; |
| |
| struct built_in_command { |
| const char *cmd; /* name */ |
| const char *descr; /* description */ |
| int (*function) (struct child_prog *); /* function ptr */ |
| }; |
| |
| /* function prototypes for builtins */ |
| static int builtin_cd(struct child_prog *cmd); |
| static int builtin_exec(struct child_prog *cmd); |
| static int builtin_exit(struct child_prog *cmd); |
| static int builtin_fg_bg(struct child_prog *cmd); |
| static int builtin_help(struct child_prog *cmd); |
| static int builtin_jobs(struct child_prog *dummy); |
| static int builtin_pwd(struct child_prog *dummy); |
| static int builtin_export(struct child_prog *cmd); |
| static int builtin_source(struct child_prog *cmd); |
| static int builtin_unset(struct child_prog *cmd); |
| static int builtin_read(struct child_prog *cmd); |
| |
| |
| /* function prototypes for shell stuff */ |
| static void checkjobs(struct jobset *job_list); |
| static void remove_job(struct jobset *j_list, struct job *job); |
| static int get_command_bufsiz(FILE *source, char *command); |
| static int parse_command(char **command_ptr, struct job *job, int *inbg); |
| static int run_command(struct job *newjob, int inbg, int outpipe[2]); |
| static int pseudo_exec(struct child_prog *cmd) NORETURN; |
| static int busy_loop(FILE *input); |
| |
| |
| /* Table of built-in functions (these are non-forking builtins, meaning they |
| * can change global variables in the parent shell process but they will not |
| * work with pipes and redirects; 'unset foo | whatever' will not work) */ |
| static const struct built_in_command bltins[] = { |
| {"bg" , "Resume a job in the background", builtin_fg_bg}, |
| {"cd" , "Change working directory", builtin_cd}, |
| {"exec" , "Exec command, replacing this shell with the exec'd process", builtin_exec}, |
| {"exit" , "Exit from shell()", builtin_exit}, |
| {"fg" , "Bring job into the foreground", builtin_fg_bg}, |
| {"jobs" , "Lists the active jobs", builtin_jobs}, |
| {"export", "Set environment variable", builtin_export}, |
| {"unset" , "Unset environment variable", builtin_unset}, |
| {"read" , "Input environment variable", builtin_read}, |
| {"." , "Source-in and run commands in a file", builtin_source}, |
| /* These were "forked applets", but distinction was nuked */ |
| /* Original comment retained: */ |
| /* Table of forking built-in functions (things that fork cannot change global |
| * variables in the parent process, such as the current working directory) */ |
| {"pwd" , "Print current directory", builtin_pwd}, |
| {"help" , "List shell built-in commands", builtin_help}, |
| /* to do: add ulimit */ |
| }; |
| |
| |
| #define VEC_LAST(v) v[ARRAY_SIZE(v)-1] |
| |
| |
| static int shell_context; /* Type prompt trigger (PS1 or PS2) */ |
| |
| |
| /* Globals that are static to this file */ |
| static char *cwd; |
| static char *local_pending_command; |
| static struct jobset job_list = { NULL, NULL }; |
| static int global_argc; |
| static char **global_argv; |
| static llist_t *close_me_list; |
| static int last_return_code; |
| static int last_bg_pid; |
| static unsigned int last_jobid; |
| static int shell_terminal; |
| static const char *PS1; |
| static const char *PS2 = "> "; |
| |
| |
| #ifdef DEBUG_SHELL |
| static inline void debug_printf(const char *format, ...) |
| { |
| va_list args; |
| va_start(args, format); |
| vfprintf(stderr, format, args); |
| va_end(args); |
| } |
| #else |
| static inline void debug_printf(const char UNUSED_PARAM *format, ...) { } |
| #endif |
| |
| /* |
| Most builtins need access to the struct child_prog that has |
| their arguments, previously coded as cmd->progs[0]. That coding |
| can exhibit a bug, if the builtin is not the first command in |
| a pipeline: "echo foo | exec sort" will attempt to exec foo. |
| |
| builtin previous use notes |
| ------ ----------------- --------- |
| cd cmd->progs[0] |
| exec cmd->progs[0] squashed bug: didn't look for applets or forking builtins |
| exit cmd->progs[0] |
| fg_bg cmd->progs[0], job_list->head, job_list->fg |
| help 0 |
| jobs job_list->head |
| pwd 0 |
| export cmd->progs[0] |
| source cmd->progs[0] |
| unset cmd->progs[0] |
| read cmd->progs[0] |
| |
| I added "struct job *family;" to struct child_prog, |
| and switched API to builtin_foo(struct child_prog *child); |
| So cmd->text becomes child->family->text |
| cmd->job_context becomes child->family->job_context |
| cmd->progs[0] becomes *child |
| job_list becomes child->family->job_list |
| */ |
| |
| |
| static void update_cwd(void) |
| { |
| cwd = xrealloc_getcwd_or_warn(cwd); |
| if (!cwd) |
| cwd = xstrdup(bb_msg_unknown); |
| } |
| |
| /* built-in 'cd <path>' handler */ |
| static int builtin_cd(struct child_prog *child) |
| { |
| char *newdir; |
| |
| if (child->argv[1] == NULL) |
| newdir = getenv("HOME"); |
| else |
| newdir = child->argv[1]; |
| if (chdir(newdir)) { |
| bb_perror_msg("cd: %s", newdir); |
| return EXIT_FAILURE; |
| } |
| update_cwd(); |
| return EXIT_SUCCESS; |
| } |
| |
| /* built-in 'exec' handler */ |
| static int builtin_exec(struct child_prog *child) |
| { |
| if (child->argv[1] == NULL) |
| return EXIT_SUCCESS; /* Really? */ |
| child->argv++; |
| while (close_me_list) |
| close((long)llist_pop(&close_me_list)); |
| pseudo_exec(child); |
| /* never returns */ |
| } |
| |
| /* built-in 'exit' handler */ |
| static int builtin_exit(struct child_prog *child) |
| { |
| if (child->argv[1] == NULL) |
| exit(EXIT_SUCCESS); |
| |
| exit(atoi(child->argv[1])); |
| } |
| |
| /* built-in 'fg' and 'bg' handler */ |
| static int builtin_fg_bg(struct child_prog *child) |
| { |
| int i, jobnum; |
| struct job *job; |
| |
| /* If they gave us no args, assume they want the last backgrounded task */ |
| if (!child->argv[1]) { |
| for (job = child->family->job_list->head; job; job = job->next) { |
| if (job->jobid == last_jobid) { |
| goto found; |
| } |
| } |
| bb_error_msg("%s: no current job", child->argv[0]); |
| return EXIT_FAILURE; |
| } |
| if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { |
| bb_error_msg(bb_msg_invalid_arg, child->argv[1], child->argv[0]); |
| return EXIT_FAILURE; |
| } |
| for (job = child->family->job_list->head; job; job = job->next) { |
| if (job->jobid == jobnum) { |
| goto found; |
| } |
| } |
| bb_error_msg("%s: %d: no such job", child->argv[0], jobnum); |
| return EXIT_FAILURE; |
| found: |
| if (*child->argv[0] == 'f') { |
| /* Put the job into the foreground. */ |
| tcsetpgrp(shell_terminal, job->pgrp); |
| |
| child->family->job_list->fg = job; |
| } |
| |
| /* Restart the processes in the job */ |
| for (i = 0; i < job->num_progs; i++) |
| job->progs[i].is_stopped = 0; |
| |
| job->stopped_progs = 0; |
| |
| i = kill(- job->pgrp, SIGCONT); |
| if (i < 0) { |
| if (errno == ESRCH) { |
| remove_job(&job_list, job); |
| } else { |
| bb_perror_msg("kill (SIGCONT)"); |
| } |
| } |
| |
| return EXIT_SUCCESS; |
| } |
| |
| /* built-in 'help' handler */ |
| static int builtin_help(struct child_prog UNUSED_PARAM *dummy) |
| { |
| const struct built_in_command *x; |
| |
| printf( |
| "Built-in commands:\n" |
| "------------------\n"); |
| for (x = bltins; x <= &VEC_LAST(bltins); x++) { |
| if (x->descr == NULL) |
| continue; |
| printf("%s\t%s\n", x->cmd, x->descr); |
| } |
| bb_putchar('\n'); |
| return EXIT_SUCCESS; |
| } |
| |
| /* built-in 'jobs' handler */ |
| static int builtin_jobs(struct child_prog *child) |
| { |
| struct job *job; |
| const char *status_string; |
| |
| for (job = child->family->job_list->head; job; job = job->next) { |
| if (job->running_progs == job->stopped_progs) |
| status_string = "Stopped"; |
| else |
| status_string = "Running"; |
| |
| printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); |
| } |
| return EXIT_SUCCESS; |
| } |
| |
| |
| /* built-in 'pwd' handler */ |
| static int builtin_pwd(struct child_prog UNUSED_PARAM *dummy) |
| { |
| update_cwd(); |
| puts(cwd); |
| return EXIT_SUCCESS; |
| } |
| |
| /* built-in 'export VAR=value' handler */ |
| static int builtin_export(struct child_prog *child) |
| { |
| int res; |
| char *v = child->argv[1]; |
| |
| if (v == NULL) { |
| char **e; |
| for (e = environ; *e; e++) { |
| puts(*e); |
| } |
| return 0; |
| } |
| res = putenv(v); |
| if (res) |
| bb_perror_msg("export"); |
| #if ENABLE_FEATURE_EDITING_FANCY_PROMPT |
| if (strncmp(v, "PS1=", 4) == 0) |
| PS1 = getenv("PS1"); |
| #endif |
| |
| #if ENABLE_LOCALE_SUPPORT |
| // TODO: why getenv? "" would be just as good... |
| if (strncmp(v, "LC_ALL=", 7) == 0) |
| setlocale(LC_ALL, getenv("LC_ALL")); |
| if (strncmp(v, "LC_CTYPE=", 9) == 0) |
| setlocale(LC_CTYPE, getenv("LC_CTYPE")); |
| #endif |
| |
| return res; |
| } |
| |
| /* built-in 'read VAR' handler */ |
| static int builtin_read(struct child_prog *child) |
| { |
| int res = 0, len; |
| char *s; |
| char string[MAX_READ]; |
| |
| if (child->argv[1]) { |
| /* argument (VAR) given: put "VAR=" into buffer */ |
| safe_strncpy(string, child->argv[1], MAX_READ-1); |
| len = strlen(string); |
| string[len++] = '='; |
| string[len] = '\0'; |
| fgets(&string[len], sizeof(string) - len, stdin); /* read string */ |
| res = strlen(string); |
| if (res > len) |
| string[--res] = '\0'; /* chomp trailing newline */ |
| /* |
| ** string should now contain "VAR=<value>" |
| ** copy it (putenv() won't do that, so we must make sure |
| ** the string resides in a static buffer!) |
| */ |
| res = -1; |
| s = strdup(string); |
| if (s) |
| res = putenv(s); |
| if (res) |
| bb_perror_msg("read"); |
| } else |
| fgets(string, sizeof(string), stdin); |
| |
| return res; |
| } |
| |
| /* Built-in '.' handler (read-in and execute commands from file) */ |
| static int builtin_source(struct child_prog *child) |
| { |
| FILE *input; |
| int status; |
| |
| input = fopen_or_warn(child->argv[1], "r"); |
| if (!input) { |
| return EXIT_FAILURE; |
| } |
| |
| llist_add_to(&close_me_list, (void *)(long)fileno(input)); |
| /* Now run the file */ |
| status = busy_loop(input); |
| fclose(input); |
| llist_pop(&close_me_list); |
| return status; |
| } |
| |
| /* built-in 'unset VAR' handler */ |
| static int builtin_unset(struct child_prog *child) |
| { |
| if (child->argv[1] == NULL) { |
| printf(bb_msg_requires_arg, "unset"); |
| return EXIT_FAILURE; |
| } |
| unsetenv(child->argv[1]); |
| return EXIT_SUCCESS; |
| } |
| |
| #if ENABLE_LASH_JOB_CONTROL |
| /* free up all memory from a job */ |
| static void free_job(struct job *cmd) |
| { |
| int i; |
| struct jobset *keep; |
| |
| for (i = 0; i < cmd->num_progs; i++) { |
| free(cmd->progs[i].argv); |
| #if ENABLE_LASH_PIPE_N_REDIRECTS |
| free(cmd->progs[i].redirects); |
| #endif |
| } |
| free(cmd->progs); |
| free(cmd->text); |
| free(cmd->cmdbuf); |
| keep = cmd->job_list; |
| memset(cmd, 0, sizeof(struct job)); |
| cmd->job_list = keep; |
| } |
| |
| /* remove a job from a jobset */ |
| static void remove_job(struct jobset *j_list, struct job *job) |
| { |
| struct job *prevjob; |
| |
| free_job(job); |
| if (job == j_list->head) { |
| j_list->head = job->next; |
| } else { |
| prevjob = j_list->head; |
| while (prevjob->next != job) |
| prevjob = prevjob->next; |
| prevjob->next = job->next; |
| } |
| |
| if (j_list->head) |
| last_jobid = j_list->head->jobid; |
| else |
| last_jobid = 0; |
| |
| free(job); |
| } |
| |
| /* Checks to see if any background processes have exited -- if they |
| have, figure out why and see if a job has completed */ |
| static void checkjobs(struct jobset *j_list) |
| { |
| struct job *job; |
| pid_t childpid; |
| int status; |
| int prognum = 0; |
| |
| while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) { |
| for (job = j_list->head; job; job = job->next) { |
| prognum = 0; |
| while (prognum < job->num_progs && |
| job->progs[prognum].pid != childpid) prognum++; |
| if (prognum < job->num_progs) |
| break; |
| } |
| |
| /* This happens on backticked commands */ |
| if (job == NULL) |
| return; |
| |
| if (WIFEXITED(status) || WIFSIGNALED(status)) { |
| /* child exited */ |
| job->running_progs--; |
| job->progs[prognum].pid = 0; |
| |
| if (!job->running_progs) { |
| printf(JOB_STATUS_FORMAT, job->jobid, "Done", job->text); |
| last_jobid = 0; |
| remove_job(j_list, job); |
| } |
| } else { |
| /* child stopped */ |
| job->stopped_progs++; |
| job->progs[prognum].is_stopped = 1; |
| } |
| } |
| |
| if (childpid == -1 && errno != ECHILD) |
| bb_perror_msg("waitpid"); |
| } |
| #else |
| static void checkjobs(struct jobset *j_list) |
| { |
| } |
| static void free_job(struct job *cmd) |
| { |
| } |
| static void remove_job(struct jobset *j_list, struct job *job) |
| { |
| } |
| #endif |
| |
| #if ENABLE_LASH_PIPE_N_REDIRECTS |
| /* squirrel != NULL means we squirrel away copies of stdin, stdout, |
| * and stderr if they are redirected. */ |
| static int setup_redirects(struct child_prog *prog, int squirrel[]) |
| { |
| int i; |
| int openfd; |
| int mode = O_RDONLY; |
| struct redir_struct *redir = prog->redirects; |
| |
| for (i = 0; i < prog->num_redirects; i++, redir++) { |
| switch (redir->type) { |
| case REDIRECT_INPUT: |
| mode = O_RDONLY; |
| break; |
| case REDIRECT_OVERWRITE: |
| mode = O_WRONLY | O_CREAT | O_TRUNC; |
| break; |
| case REDIRECT_APPEND: |
| mode = O_WRONLY | O_CREAT | O_APPEND; |
| break; |
| } |
| |
| openfd = open_or_warn(redir->filename, mode); |
| if (openfd < 0) { |
| /* this could get lost if stderr has been redirected, but |
| bash and ash both lose it as well (though zsh doesn't!) */ |
| return 1; |
| } |
| |
| if (openfd != redir->fd) { |
| if (squirrel && redir->fd < 3) { |
| squirrel[redir->fd] = dup(redir->fd); |
| close_on_exec_on(squirrel[redir->fd]); |
| } |
| dup2(openfd, redir->fd); |
| close(openfd); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void restore_redirects(int squirrel[]) |
| { |
| int i, fd; |
| for (i = 0; i < 3; i++) { |
| fd = squirrel[i]; |
| if (fd != -1) { |
| /* No error checking. I sure wouldn't know what |
| * to do with an error if I found one! */ |
| dup2(fd, i); |
| close(fd); |
| } |
| } |
| } |
| #else |
| static inline int setup_redirects(struct child_prog *prog, int squirrel[]) |
| { |
| return 0; |
| } |
| static inline void restore_redirects(int squirrel[]) |
| { |
| } |
| #endif |
| |
| static inline void cmdedit_set_initial_prompt(void) |
| { |
| #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT |
| PS1 = NULL; |
| #else |
| PS1 = getenv("PS1"); |
| if (PS1 == 0) |
| PS1 = "\\w \\$ "; |
| #endif |
| } |
| |
| static inline const char* setup_prompt_string(void) |
| { |
| #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT |
| /* Set up the prompt */ |
| if (shell_context == 0) { |
| char *ns; |
| free((char*)PS1); |
| ns = xmalloc(strlen(cwd)+4); |
| sprintf(ns, "%s %c ", cwd, (geteuid() != 0) ? '$': '#'); |
| PS1 = ns; |
| return ns; |
| } else { |
| return PS2; |
| } |
| #else |
| return (shell_context == 0)? PS1 : PS2; |
| #endif |
| } |
| |
| #if ENABLE_FEATURE_EDITING |
| static line_input_t *line_input_state; |
| #endif |
| |
| static int get_command_bufsiz(FILE *source, char *command) |
| { |
| const char *prompt_str; |
| |
| if (source == NULL) { |
| if (local_pending_command) { |
| /* a command specified (-c option): return it & mark it done */ |
| strncpy(command, local_pending_command, BUFSIZ); |
| local_pending_command = NULL; |
| return 0; |
| } |
| return 1; |
| } |
| |
| if (source == stdin) { |
| prompt_str = setup_prompt_string(); |
| |
| #if ENABLE_FEATURE_EDITING |
| /* |
| ** enable command line editing only while a command line |
| ** is actually being read; otherwise, we'll end up bequeathing |
| ** atexit() handlers and other unwanted stuff to our |
| ** child processes (rob@sysgo.de) |
| */ |
| read_line_input(prompt_str, command, BUFSIZ, line_input_state); |
| return 0; |
| #else |
| fputs(prompt_str, stdout); |
| #endif |
| } |
| |
| if (!fgets(command, BUFSIZ - 2, source)) { |
| if (source == stdin) |
| bb_putchar('\n'); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static char * strsep_space(char *string, int * ix) |
| { |
| /* Short circuit the trivial case */ |
| if (!string || ! string[*ix]) |
| return NULL; |
| |
| /* Find the end of the token. */ |
| while (string[*ix] && !isspace(string[*ix]) ) { |
| (*ix)++; |
| } |
| |
| /* Find the end of any whitespace trailing behind |
| * the token and let that be part of the token */ |
| while (string[*ix] && (isspace)(string[*ix]) ) { |
| (*ix)++; |
| } |
| |
| if (!*ix) { |
| /* Nothing useful was found */ |
| return NULL; |
| } |
| |
| return xstrndup(string, *ix); |
| } |
| |
| static int expand_arguments(char *command) |
| { |
| static const char out_of_space[] ALIGN1 = "out of space during expansion"; |
| |
| int total_length = 0, length, i, retval, ix = 0; |
| expand_t expand_result; |
| char *tmpcmd, *cmd, *cmd_copy; |
| char *src, *dst, *var; |
| int flags = GLOB_NOCHECK |
| #ifdef GLOB_BRACE |
| | GLOB_BRACE |
| #endif |
| #ifdef GLOB_TILDE |
| | GLOB_TILDE |
| #endif |
| ; |
| |
| /* get rid of the terminating \n */ |
| chomp(command); |
| |
| /* Fix up escape sequences to be the Real Thing(tm) */ |
| while (command && command[ix]) { |
| if (command[ix] == '\\') { |
| const char *tmp = command+ix+1; |
| command[ix] = bb_process_escape_sequence( &tmp ); |
| memmove(command+ix + 1, tmp, strlen(tmp)+1); |
| } |
| ix++; |
| } |
| /* Use glob and then fixup environment variables and such */ |
| |
| /* It turns out that glob is very stupid. We have to feed it one word at a |
| * time since it can't cope with a full string. Here we convert command |
| * (char*) into cmd (char**, one word per string) */ |
| |
| /* We need a clean copy, so strsep can mess up the copy while |
| * we write stuff into the original (in a minute) */ |
| cmd = cmd_copy = xstrdup(command); |
| *command = '\0'; |
| for (ix = 0, tmpcmd = cmd; |
| (tmpcmd = strsep_space(cmd, &ix)) != NULL; cmd += ix, ix = 0) { |
| if (*tmpcmd == '\0') |
| break; |
| /* we need to trim() the result for glob! */ |
| trim(tmpcmd); |
| retval = glob(tmpcmd, flags, NULL, &expand_result); |
| free(tmpcmd); /* Free mem allocated by strsep_space */ |
| if (retval == GLOB_NOSPACE) { |
| /* Mem may have been allocated... */ |
| globfree(&expand_result); |
| bb_error_msg(out_of_space); |
| return FALSE; |
| } else if (retval != 0) { |
| /* Some other error. GLOB_NOMATCH shouldn't |
| * happen because of the GLOB_NOCHECK flag in |
| * the glob call. */ |
| bb_error_msg("syntax error"); |
| return FALSE; |
| } else { |
| /* Convert from char** (one word per string) to a simple char*, |
| * but don't overflow command which is BUFSIZ in length */ |
| for (i = 0; i < expand_result.gl_pathc; i++) { |
| length = strlen(expand_result.gl_pathv[i]); |
| if (total_length+length+1 >= BUFSIZ) { |
| bb_error_msg(out_of_space); |
| return FALSE; |
| } |
| strcat(command+total_length, " "); |
| total_length += 1; |
| strcat(command+total_length, expand_result.gl_pathv[i]); |
| total_length += length; |
| } |
| globfree(&expand_result); |
| } |
| } |
| free(cmd_copy); |
| trim(command); |
| |
| /* Now do the shell variable substitutions which |
| * wordexp can't do for us, namely $? and $! */ |
| src = command; |
| while ((dst = strchr(src,'$')) != NULL) { |
| var = NULL; |
| switch (*(dst+1)) { |
| case '?': |
| var = itoa(last_return_code); |
| break; |
| case '!': |
| if (last_bg_pid == -1) |
| *var = '\0'; |
| else |
| var = itoa(last_bg_pid); |
| break; |
| /* Everything else like $$, $#, $[0-9], etc. should all be |
| * expanded by wordexp(), so we can in theory skip that stuff |
| * here, but just to be on the safe side (i.e., since uClibc |
| * wordexp doesn't do this stuff yet), lets leave it in for |
| * now. */ |
| case '$': |
| var = itoa(getpid()); |
| break; |
| case '#': |
| var = itoa(global_argc - 1); |
| break; |
| case '0':case '1':case '2':case '3':case '4': |
| case '5':case '6':case '7':case '8':case '9': |
| { |
| int ixx = *(dst+1)-48+1; |
| if (ixx >= global_argc) { |
| var = '\0'; |
| } else { |
| var = global_argv[ixx]; |
| } |
| } |
| break; |
| |
| } |
| if (var) { |
| /* a single character construction was found, and |
| * already handled in the case statement */ |
| src = dst + 2; |
| } else { |
| /* Looks like an environment variable */ |
| char delim_hold; |
| int num_skip_chars = 0; |
| int dstlen = strlen(dst); |
| /* Is this a ${foo} type variable? */ |
| if (dstlen >= 2 && *(dst+1) == '{') { |
| src = strchr(dst+1, '}'); |
| num_skip_chars = 1; |
| } else { |
| src = dst + 1; |
| while ((isalnum)(*src) || *src == '_') src++; |
| } |
| if (src == NULL) { |
| src = dst+dstlen; |
| } |
| delim_hold = *src; |
| *src = '\0'; /* temporary */ |
| var = getenv(dst + 1 + num_skip_chars); |
| *src = delim_hold; |
| src += num_skip_chars; |
| } |
| if (var == NULL) { |
| /* Seems we got an un-expandable variable. So delete it. */ |
| var = (char*)""; |
| } |
| { |
| int subst_len = strlen(var); |
| int trail_len = strlen(src); |
| if (dst+subst_len+trail_len >= command+BUFSIZ) { |
| bb_error_msg(out_of_space); |
| return FALSE; |
| } |
| /* Move stuff to the end of the string to accommodate |
| * filling the created gap with the new stuff */ |
| memmove(dst+subst_len, src, trail_len+1); |
| /* Now copy in the new stuff */ |
| memcpy(dst, var, subst_len); |
| src = dst+subst_len; |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| /* Return cmd->num_progs as 0 if no command is present (e.g. an empty |
| line). If a valid command is found, command_ptr is set to point to |
| the beginning of the next command (if the original command had more |
| then one job associated with it) or NULL if no more commands are |
| present. */ |
| static int parse_command(char **command_ptr, struct job *job, int *inbg) |
| { |
| char *command; |
| char *return_command = NULL; |
| char *src, *buf; |
| int argc_l; |
| int flag; |
| int argv_alloced; |
| char quote = '\0'; |
| struct child_prog *prog; |
| #if ENABLE_LASH_PIPE_N_REDIRECTS |
| int i; |
| char *chptr; |
| #endif |
| |
| /* skip leading white space */ |
| *command_ptr = skip_whitespace(*command_ptr); |
| |
| /* this handles empty lines or leading '#' characters */ |
| if (!**command_ptr || (**command_ptr == '#')) { |
| job->num_progs = 0; |
| return 0; |
| } |
| |
| *inbg = 0; |
| job->num_progs = 1; |
| job->progs = xmalloc(sizeof(*job->progs)); |
| |
| /* We set the argv elements to point inside of this string. The |
| memory is freed by free_job(). Allocate twice the original |
| length in case we need to quote every single character. |
| |
| Getting clean memory relieves us of the task of NULL |
| terminating things and makes the rest of this look a bit |
| cleaner (though it is, admittedly, a tad less efficient) */ |
| job->cmdbuf = command = xzalloc(2*strlen(*command_ptr) + 1); |
| job->text = NULL; |
| |
| prog = job->progs; |
| prog->num_redirects = 0; |
| prog->is_stopped = 0; |
| prog->family = job; |
| #if ENABLE_LASH_PIPE_N_REDIRECTS |
| prog->redirects = NULL; |
| #endif |
| |
| argv_alloced = 5; |
| prog->argv = xmalloc(sizeof(*prog->argv) * argv_alloced); |
| prog->argv[0] = job->cmdbuf; |
| |
| flag = argc_l = 0; |
| buf = command; |
| src = *command_ptr; |
| while (*src && !(flag & LASH_OPT_DONE)) { |
| if (quote == *src) { |
| quote = '\0'; |
| } else if (quote) { |
| if (*src == '\\') { |
| src++; |
| if (!*src) { |
| bb_error_msg("character expected after \\"); |
| free_job(job); |
| return 1; |
| } |
| |
| /* in shell, "\'" should yield \' */ |
| if (*src != quote) { |
| *buf++ = '\\'; |
| *buf++ = '\\'; |
| } |
| } else if (*src == '*' || *src == '?' || *src == '[' || |
| *src == ']') *buf++ = '\\'; |
| *buf++ = *src; |
| } else if (isspace(*src)) { |
| if (*prog->argv[argc_l] || (flag & LASH_OPT_SAW_QUOTE)) { |
| buf++, argc_l++; |
| /* +1 here leaves room for the NULL which ends argv */ |
| if ((argc_l + 1) == argv_alloced) { |
| argv_alloced += 5; |
| prog->argv = xrealloc(prog->argv, |
| sizeof(*prog->argv) * argv_alloced); |
| } |
| prog->argv[argc_l] = buf; |
| flag ^= LASH_OPT_SAW_QUOTE; |
| } |
| } else |
| switch (*src) { |
| case '"': |
| case '\'': |
| quote = *src; |
| flag |= LASH_OPT_SAW_QUOTE; |
| break; |
| |
| case '#': /* comment */ |
| if (*(src-1)== '$') |
| *buf++ = *src; |
| else |
| flag |= LASH_OPT_DONE; |
| break; |
| |
| #if ENABLE_LASH_PIPE_N_REDIRECTS |
| case '>': /* redirects */ |
| case '<': |
| i = prog->num_redirects++; |
| prog->redirects = xrealloc(prog->redirects, |
| sizeof(*prog->redirects) * (i + 1)); |
| |
| prog->redirects[i].fd = -1; |
| if (buf != prog->argv[argc_l]) { |
| /* the stuff before this character may be the file number |
| being redirected */ |
| prog->redirects[i].fd = |
| strtol(prog->argv[argc_l], &chptr, 10); |
| |
| if (*chptr && *prog->argv[argc_l]) { |
| buf++, argc_l++; |
| prog->argv[argc_l] = buf; |
| } |
| } |
| |
| if (prog->redirects[i].fd == -1) { |
| if (*src == '>') |
| prog->redirects[i].fd = 1; |
| else |
| prog->redirects[i].fd = 0; |
| } |
| |
| if (*src++ == '>') { |
| if (*src == '>') |
| prog->redirects[i].type = |
| REDIRECT_APPEND, src++; |
| else |
| prog->redirects[i].type = REDIRECT_OVERWRITE; |
| } else { |
| prog->redirects[i].type = REDIRECT_INPUT; |
| } |
| |
| /* This isn't POSIX sh compliant. Oh well. */ |
| chptr = src; |
| chptr = skip_whitespace(chptr); |
| |
| if (!*chptr) { |
| bb_error_msg("file name expected after %c", *(src-1)); |
| free_job(job); |
| job->num_progs = 0; |
| return 1; |
| } |
| |
| prog->redirects[i].filename = buf; |
| while (*chptr && !isspace(*chptr)) |
| *buf++ = *chptr++; |
| |
| src = chptr - 1; /* we src++ later */ |
| prog->argv[argc_l] = ++buf; |
| break; |
| |
| case '|': /* pipe */ |
| /* finish this command */ |
| if (*prog->argv[argc_l] || flag & LASH_OPT_SAW_QUOTE) |
| argc_l++; |
| if (!argc_l) { |
| goto empty_command_in_pipe; |
| } |
| prog->argv[argc_l] = NULL; |
| |
| /* and start the next */ |
| job->num_progs++; |
| job->progs = xrealloc(job->progs, |
| sizeof(*job->progs) * job->num_progs); |
| prog = job->progs + (job->num_progs - 1); |
| prog->num_redirects = 0; |
| prog->redirects = NULL; |
| prog->is_stopped = 0; |
| prog->family = job; |
| argc_l = 0; |
| |
| argv_alloced = 5; |
| prog->argv = xmalloc(sizeof(*prog->argv) * argv_alloced); |
| prog->argv[0] = ++buf; |
| |
| src++; |
| src = skip_whitespace(src); |
| |
| if (!*src) { |
| empty_command_in_pipe: |
| bb_error_msg("empty command in pipe"); |
| free_job(job); |
| job->num_progs = 0; |
| return 1; |
| } |
| src--; /* we'll ++ it at the end of the loop */ |
| |
| break; |
| #endif |
| |
| #if ENABLE_LASH_JOB_CONTROL |
| case '&': /* background */ |
| *inbg = 1; |
| /* fallthrough */ |
| #endif |
| case ';': /* multiple commands */ |
| flag |= LASH_OPT_DONE; |
| return_command = *command_ptr + (src - *command_ptr) + 1; |
| break; |
| |
| case '\\': |
| src++; |
| if (!*src) { |
| bb_error_msg("character expected after \\"); |
| free_job(job); |
| return 1; |
| } |
| if (*src == '*' || *src == '[' || *src == ']' |
| || *src == '?') *buf++ = '\\'; |
| /* fallthrough */ |
| default: |
| *buf++ = *src; |
| } |
| |
| src++; |
| } |
| |
| if (*prog->argv[argc_l] || flag & LASH_OPT_SAW_QUOTE) { |
| argc_l++; |
| } |
| if (!argc_l) { |
| free_job(job); |
| return 0; |
| } |
| prog->argv[argc_l] = NULL; |
| |
| if (!return_command) { |
| job->text = xstrdup(*command_ptr); |
| } else { |
| /* This leaves any trailing spaces, which is a bit sloppy */ |
| job->text = xstrndup(*command_ptr, return_command - *command_ptr); |
| } |
| |
| *command_ptr = return_command; |
| |
| return 0; |
| } |
| |
| /* Run the child_prog, no matter what kind of command it uses. |
| */ |
| static int pseudo_exec(struct child_prog *child) |
| { |
| const struct built_in_command *x; |
| |
| /* Check if the command matches any of the non-forking builtins. |
| * Depending on context, this might be redundant. But it's |
| * easier to waste a few CPU cycles than it is to figure out |
| * if this is one of those cases. |
| */ |
| /* Check if the command matches any of the forking builtins. */ |
| for (x = bltins; x <= &VEC_LAST(bltins); x++) { |
| if (strcmp(child->argv[0], x->cmd) == 0) { |
| _exit(x->function(child)); |
| } |
| } |
| |
| /* Check if the command matches any busybox internal |
| * commands ("applets") here. Following discussions from |
| * November 2000 on busybox@busybox.net, don't use |
| * bb_get_last_path_component_nostrip(). This way explicit |
| * (with slashes) filenames will never be interpreted as an |
| * applet, just like with builtins. This way the user can |
| * override an applet with an explicit filename reference. |
| * The only downside to this change is that an explicit |
| * /bin/foo invocation will fork and exec /bin/foo, even if |
| * /bin/foo is a symlink to busybox. |
| */ |
| if (ENABLE_FEATURE_SH_STANDALONE) { |
| run_applet_and_exit(child->argv[0], child->argv); |
| } |
| |
| execvp(child->argv[0], child->argv); |
| |
| /* Do not use bb_perror_msg_and_die() here, since we must not |
| * call exit() but should call _exit() instead */ |
| bb_simple_perror_msg(child->argv[0]); |
| _exit(EXIT_FAILURE); |
| } |
| |
| static void insert_job(struct job *newjob, int inbg) |
| { |
| struct job *thejob; |
| struct jobset *j_list = newjob->job_list; |
| |
| /* find the ID for thejob to use */ |
| newjob->jobid = 1; |
| for (thejob = j_list->head; thejob; thejob = thejob->next) |
| if (thejob->jobid >= newjob->jobid) |
| newjob->jobid = thejob->jobid + 1; |
| |
| /* add thejob to the list of running jobs */ |
| if (!j_list->head) { |
| thejob = j_list->head = xmalloc(sizeof(*thejob)); |
| } else { |
| for (thejob = j_list->head; thejob->next; thejob = thejob->next) /* nothing */; |
| thejob->next = xmalloc(sizeof(*thejob)); |
| thejob = thejob->next; |
| } |
| |
| *thejob = *newjob; /* physically copy the struct job */ |
| thejob->next = NULL; |
| thejob->running_progs = thejob->num_progs; |
| thejob->stopped_progs = 0; |
| |
| #if ENABLE_LASH_JOB_CONTROL |
| if (inbg) { |
| /* we don't wait for background thejobs to return -- append it |
| to the list of backgrounded thejobs and leave it alone */ |
| printf("[%d] %d\n", thejob->jobid, |
| newjob->progs[newjob->num_progs - 1].pid); |
| last_jobid = newjob->jobid; |
| last_bg_pid = newjob->progs[newjob->num_progs - 1].pid; |
| } else { |
| newjob->job_list->fg = thejob; |
| |
| /* move the new process group into the foreground */ |
| /* Ignore errors since child could have already exited */ |
| tcsetpgrp(shell_terminal, newjob->pgrp); |
| } |
| #endif |
| } |
| |
| static int run_command(struct job *newjob, int inbg, int outpipe[2]) |
| { |
| /* struct job *thejob; */ |
| int i; |
| int nextin, nextout; |
| int pipefds[2]; /* pipefd[0] is for reading */ |
| const struct built_in_command *x; |
| struct child_prog *child; |
| |
| nextin = 0; |
| for (i = 0; i < newjob->num_progs; i++) { |
| child = &(newjob->progs[i]); |
| |
| nextout = 1; |
| if ((i + 1) < newjob->num_progs) { |
| xpipe(pipefds); |
| nextout = pipefds[1]; |
| } else if (outpipe[1] != -1) { |
| nextout = outpipe[1]; |
| } |
| |
| /* Check if the command matches any non-forking builtins, |
| * but only if this is a simple command. |
| * Non-forking builtins within pipes have to fork anyway, |
| * and are handled in pseudo_exec. "echo foo | read bar" |
| * is doomed to failure, and doesn't work on bash, either. |
| */ |
| if (newjob->num_progs == 1) { |
| int rcode; |
| int squirrel[] = {-1, -1, -1}; |
| |
| /* Check if the command sets an environment variable. */ |
| if (strchr(child->argv[0], '=') != NULL) { |
| child->argv[1] = child->argv[0]; |
| return builtin_export(child); |
| } |
| |
| for (x = bltins; x <= &VEC_LAST(bltins); x++) { |
| if (strcmp(child->argv[0], x->cmd) == 0) { |
| setup_redirects(child, squirrel); |
| rcode = x->function(child); |
| restore_redirects(squirrel); |
| return rcode; |
| } |
| } |
| #if ENABLE_FEATURE_SH_STANDALONE |
| { |
| int a = find_applet_by_name(child->argv[i]); |
| if (a >= 0 && APPLET_IS_NOFORK(a)) { |
| setup_redirects(child, squirrel); |
| rcode = run_nofork_applet(a, child->argv + i); |
| restore_redirects(squirrel); |
| return rcode; |
| } |
| } |
| #endif |
| } |
| |
| #if BB_MMU |
| child->pid = fork(); |
| #else |
| child->pid = vfork(); |
| #endif |
| if (!child->pid) { |
| /* Set the handling for job control signals back to the default. */ |
| signal(SIGINT, SIG_DFL); |
| signal(SIGQUIT, SIG_DFL); |
| signal(SIGTSTP, SIG_DFL); |
| signal(SIGTTIN, SIG_DFL); |
| signal(SIGTTOU, SIG_DFL); |
| signal(SIGCHLD, SIG_DFL); |
| |
| /* Close all open filehandles. */ |
| while (close_me_list) |
| close((long)llist_pop(&close_me_list)); |
| |
| if (outpipe[1] != -1) { |
| close(outpipe[0]); |
| } |
| if (nextin != 0) { |
| dup2(nextin, 0); |
| close(nextin); |
| } |
| |
| if (nextout != 1) { |
| dup2(nextout, 1); |
| dup2(nextout, 2); /* Really? */ |
| close(nextout); |
| close(pipefds[0]); |
| } |
| |
| /* explicit redirects override pipes */ |
| setup_redirects(child,NULL); |
| |
| pseudo_exec(child); |
| } |
| if (outpipe[1] != -1) { |
| close(outpipe[1]); |
| } |
| |
| /* put our child in the process group whose leader is the |
| first process in this pipe */ |
| setpgid(child->pid, newjob->progs[0].pid); |
| if (nextin != 0) |
| close(nextin); |
| if (nextout != 1) |
| close(nextout); |
| |
| /* If there isn't another process, nextin is garbage |
| but it doesn't matter */ |
| nextin = pipefds[0]; |
| } |
| |
| newjob->pgrp = newjob->progs[0].pid; |
| |
| insert_job(newjob, inbg); |
| |
| return 0; |
| } |
| |
| static int busy_loop(FILE *input) |
| { |
| char *command; |
| char *next_command = NULL; |
| struct job newjob; |
| int i; |
| int inbg = 0; |
| int status; |
| #if ENABLE_LASH_JOB_CONTROL |
| pid_t parent_pgrp; |
| /* save current owner of TTY so we can restore it on exit */ |
| parent_pgrp = tcgetpgrp(shell_terminal); |
| #endif |
| newjob.job_list = &job_list; |
| newjob.job_context = DEFAULT_CONTEXT; |
| |
| command = xzalloc(BUFSIZ); |
| |
| while (1) { |
| if (!job_list.fg) { |
| /* no job is in the foreground */ |
| |
| /* see if any background processes have exited */ |
| checkjobs(&job_list); |
| |
| if (!next_command) { |
| if (get_command_bufsiz(input, command)) |
| break; |
| next_command = command; |
| } |
| |
| if (!expand_arguments(next_command)) { |
| free(command); |
| command = xzalloc(BUFSIZ); |
| next_command = NULL; |
| continue; |
| } |
| |
| if (!parse_command(&next_command, &newjob, &inbg) && |
| newjob.num_progs) { |
| int pipefds[2] = { -1, -1 }; |
| debug_printf("job=%p fed to run_command by busy_loop()'\n", |
| &newjob); |
| run_command(&newjob, inbg, pipefds); |
| } |
| else { |
| free(command); |
| command = xzalloc(BUFSIZ); |
| next_command = NULL; |
| } |
| } else { |
| /* a job is running in the foreground; wait for it */ |
| i = 0; |
| while (!job_list.fg->progs[i].pid || |
| job_list.fg->progs[i].is_stopped == 1) i++; |
| |
| if (waitpid(job_list.fg->progs[i].pid, &status, WUNTRACED) < 0) { |
| if (errno != ECHILD) { |
| bb_perror_msg_and_die("waitpid(%d)", job_list.fg->progs[i].pid); |
| } |
| } |
| |
| if (WIFEXITED(status) || WIFSIGNALED(status)) { |
| /* the child exited */ |
| job_list.fg->running_progs--; |
| job_list.fg->progs[i].pid = 0; |
| |
| last_return_code = WEXITSTATUS(status); |
| |
| if (!job_list.fg->running_progs) { |
| /* child exited */ |
| remove_job(&job_list, job_list.fg); |
| job_list.fg = NULL; |
| } |
| } |
| #if ENABLE_LASH_JOB_CONTROL |
| else { |
| /* the child was stopped */ |
| job_list.fg->stopped_progs++; |
| job_list.fg->progs[i].is_stopped = 1; |
| |
| if (job_list.fg->stopped_progs == job_list.fg->running_progs) { |
| printf("\n" JOB_STATUS_FORMAT, job_list.fg->jobid, |
| "Stopped", job_list.fg->text); |
| job_list.fg = NULL; |
| } |
| } |
| |
| if (!job_list.fg) { |
| /* move the shell to the foreground */ |
| /* suppress messages when run from /linuxrc mag@sysgo.de */ |
| if (tcsetpgrp(shell_terminal, getpgrp()) && errno != ENOTTY) |
| bb_perror_msg("tcsetpgrp"); |
| } |
| #endif |
| } |
| } |
| free(command); |
| |
| #if ENABLE_LASH_JOB_CONTROL |
| /* return controlling TTY back to parent process group before exiting */ |
| if (tcsetpgrp(shell_terminal, parent_pgrp) && errno != ENOTTY) |
| bb_perror_msg("tcsetpgrp"); |
| #endif |
| |
| /* return exit status if called with "-c" */ |
| if (input == NULL && WIFEXITED(status)) |
| return WEXITSTATUS(status); |
| |
| return 0; |
| } |
| |
| #if ENABLE_FEATURE_CLEAN_UP |
| static void free_memory(void) |
| { |
| free(cwd); |
| |
| if (job_list.fg && !job_list.fg->running_progs) { |
| remove_job(&job_list, job_list.fg); |
| } |
| } |
| #else |
| void free_memory(void); |
| #endif |
| |
| #if ENABLE_LASH_JOB_CONTROL |
| /* Make sure we have a controlling tty. If we get started under a job |
| * aware app (like bash for example), make sure we are now in charge so |
| * we don't fight over who gets the foreground */ |
| static void setup_job_control(void) |
| { |
| int status; |
| pid_t shell_pgrp; |
| |
| /* Loop until we are in the foreground. */ |
| while ((status = tcgetpgrp(shell_terminal)) >= 0) { |
| shell_pgrp = getpgrp(); |
| if (status == shell_pgrp) { |
| break; |
| } |
| kill(- shell_pgrp, SIGTTIN); |
| } |
| |
| /* Ignore interactive and job-control signals. */ |
| signal(SIGINT, SIG_IGN); |
| signal(SIGQUIT, SIG_IGN); |
| signal(SIGTSTP, SIG_IGN); |
| signal(SIGTTIN, SIG_IGN); |
| signal(SIGTTOU, SIG_IGN); |
| signal(SIGCHLD, SIG_IGN); |
| |
| /* Put ourselves in our own process group. */ |
| setsid(); |
| shell_pgrp = getpid(); |
| setpgid(shell_pgrp, shell_pgrp); |
| |
| /* Grab control of the terminal. */ |
| tcsetpgrp(shell_terminal, shell_pgrp); |
| } |
| #else |
| static inline void setup_job_control(void) |
| { |
| } |
| #endif |
| |
| int lash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int lash_main(int argc, char **argv) |
| { |
| unsigned opt; |
| FILE *input = stdin; |
| |
| global_argc = argc; |
| global_argv = argv; |
| |
| #if ENABLE_FEATURE_EDITING |
| line_input_state = new_line_input_t(FOR_SHELL); |
| #endif |
| |
| /* These variables need re-initializing when recursing */ |
| last_jobid = 0; |
| close_me_list = NULL; |
| job_list.head = NULL; |
| job_list.fg = NULL; |
| last_return_code = 1; |
| |
| if (global_argv[0] && global_argv[0][0] == '-') { |
| FILE *prof_input; |
| prof_input = fopen_for_read("/etc/profile"); |
| if (prof_input) { |
| llist_add_to(&close_me_list, (void *)(long)fileno(prof_input)); |
| /* Now run the file */ |
| busy_loop(prof_input); |
| fclose_if_not_stdin(prof_input); |
| llist_pop(&close_me_list); |
| } |
| } |
| |
| opt = getopt32(argv, "+ic:", &local_pending_command); |
| #define LASH_OPT_i (1<<0) |
| #define LASH_OPT_c (1<<1) |
| if (opt & LASH_OPT_c) { |
| input = NULL; |
| optind++; |
| global_argv += optind; |
| } |
| /* A shell is interactive if the `-i' flag was given, or if all of |
| * the following conditions are met: |
| * no -c command |
| * no arguments remaining or the -s flag given |
| * standard input is a terminal |
| * standard output is a terminal |
| * Refer to Posix.2, the description of the `sh' utility. */ |
| if (global_argv[optind] == NULL && input == stdin |
| && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO) |
| ) { |
| opt |= LASH_OPT_i; |
| } |
| setup_job_control(); |
| if (opt & LASH_OPT_i) { |
| /* Looks like they want an interactive shell */ |
| if (!ENABLE_FEATURE_SH_EXTRA_QUIET) { |
| printf("\n\n%s built-in shell (lash)\n" |
| "Enter 'help' for a list of built-in commands.\n\n", |
| bb_banner); |
| } |
| } else if (!local_pending_command && global_argv[optind]) { |
| //printf( "optind=%d argv[optind]='%s'\n", optind, argv[optind]); |
| input = xfopen_for_read(global_argv[optind]); |
| /* be lazy, never mark this closed */ |
| llist_add_to(&close_me_list, (void *)(long)fileno(input)); |
| } |
| |
| /* initialize the cwd -- this is never freed...*/ |
| update_cwd(); |
| |
| if (ENABLE_FEATURE_CLEAN_UP) atexit(free_memory); |
| |
| if (ENABLE_FEATURE_EDITING) cmdedit_set_initial_prompt(); |
| else PS1 = NULL; |
| |
| return busy_loop(input); |
| } |