src/vppinfra/unix-misc.c - fdio/vpp - Gitiles

 /*
  * Copyright (c) 2015 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 /*
   Copyright (c) 2005 Eliot Dresselhaus

   Permission is hereby granted, free of charge, to any person obtaining
   a copy of this software and associated documentation files (the
   "Software"), to deal in the Software without restriction, including
   without limitation the rights to use, copy, modify, merge, publish,
   distribute, sublicense, and/or sell copies of the Software, and to
   permit persons to whom the Software is furnished to do so, subject to
   the following conditions:

   The above copyright notice and this permission notice shall be
   included in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
   LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
   OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
   WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif

 #include <vppinfra/error.h>
 #include <vppinfra/os.h>
 #include <vppinfra/bitmap.h>
 #include <vppinfra/unix.h>
 #include <vppinfra/format.h>
 #ifdef __linux__
 #include <vppinfra/linux/sysfs.h>
 #include <sched.h>
 #elif defined(__FreeBSD__)
 #define _WANT_FREEBSD_BITSET
 #include <sys/cdefs.h>
 #include <sys/param.h>
 #include <sys/types.h>
 #include <sys/cpuset.h>
 #include <sys/domainset.h>
 #include <sys/sysctl.h>
 #endif

 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/uio.h>		/* writev */
 #include <fcntl.h>
 #include <stdio.h>		/* for sprintf */
 #include <limits.h>

 __clib_export __thread uword __os_thread_index = 0;
 __clib_export __thread uword __os_numa_index = 0;

 clib_error_t *
 clib_file_n_bytes (char *file, uword * result)
 {
   struct stat s;

   if (stat (file, &s) < 0)
     return clib_error_return_unix (0, "stat `%s'", file);

   if (S_ISREG (s.st_mode))
     *result = s.st_size;
   else
     *result = 0;

   return /* no error */ 0;
 }

 clib_error_t *
 clib_file_read_contents (char *file, u8 * result, uword n_bytes)
 {
   int fd = -1;
   uword n_done, n_left;
   clib_error_t *error = 0;
   u8 *v = result;

   if ((fd = open (file, 0)) < 0)
     return clib_error_return_unix (0, "open `%s'", file);

   n_left = n_bytes;
   n_done = 0;
   while (n_left > 0)
     {
       int n_read;
       if ((n_read = read (fd, v + n_done, n_left)) < 0)
 	{
 	  error = clib_error_return_unix (0, "open `%s'", file);
 	  goto done;
 	}

       /* End of file. */
       if (n_read == 0)
 	break;

       n_left -= n_read;
       n_done += n_read;
     }

   if (n_left > 0)
     {
       error =
 	clib_error_return (0,
 			   " `%s' expected to read %wd bytes; read only %wd",
 			   file, n_bytes, n_bytes - n_left);
       goto done;
     }

 done:
   close (fd);
   return error;
 }

 __clib_export clib_error_t *
 clib_file_contents (char *file, u8 ** result)
 {
   uword n_bytes;
   clib_error_t *error = 0;
   u8 *v;

   if ((error = clib_file_n_bytes (file, &n_bytes)))
     return error;

   v = 0;
   vec_resize (v, n_bytes);

   error = clib_file_read_contents (file, v, n_bytes);

   if (error)
     vec_free (v);
   else
     *result = v;

   return error;
 }

 __clib_export u8 *
 clib_file_get_resolved_basename (char *fmt, ...)
 {
   va_list va;
   char *p, buffer[PATH_MAX];
   u8 *link, *s = 0;
   int r;

   va_start (va, fmt);
   link = va_format (0, fmt, &va);
   va_end (va);
   vec_add1 (link, 0);

   r = readlink ((char *) link, buffer, sizeof (buffer) - 1);
   vec_free (link);

   if (r < 1)
     return 0;

   buffer[r] = 0;
   p = buffer + r - 1;
   while (p > buffer && p[-1] != '/')
     p--;

   while (p[0])
     vec_add1 (s, p++[0]);

   vec_add1 (s, 0);
   return s;
 }

 clib_error_t *
 unix_proc_file_contents (char *file, u8 ** result)
 {
   u8 *rv = 0;
   uword pos;
   int bytes, fd;

   /* Unfortunately, stat(/proc/XXX) returns zero... */
   fd = open (file, O_RDONLY);

   if (fd < 0)
     return clib_error_return_unix (0, "open `%s'", file);

   vec_validate (rv, 4095);
   pos = 0;
   while (1)
     {
       bytes = read (fd, rv + pos, 4096);
       if (bytes < 0)
 	{
 	  close (fd);
 	  vec_free (rv);
 	  return clib_error_return_unix (0, "read '%s'", file);
 	}

       if (bytes == 0)
 	{
 	  vec_set_len (rv, pos);
 	  break;
 	}
       pos += bytes;
       vec_validate (rv, pos + 4095);
     }
   *result = rv;
   close (fd);
   return 0;
 }

 __clib_export __clib_weak void
 os_panic (void)
 {
   abort ();
 }

 __clib_export __clib_weak void
 os_exit (int code)
 {
   exit (code);
 }

 __clib_export __clib_weak void
 os_puts (u8 *string, uword string_length, uword is_error)
 {
   int cpu = os_get_thread_index ();
   int nthreads = os_get_nthreads ();
   char buf[64];
   int fd = is_error ? 2 : 1;
   struct iovec iovs[2];
   int n_iovs = 0;

   if (nthreads > 1)
     {
       snprintf (buf, sizeof (buf), "%d: ", cpu);

       iovs[n_iovs].iov_base = buf;
       iovs[n_iovs].iov_len = strlen (buf);
       n_iovs++;
     }

   iovs[n_iovs].iov_base = string;
   iovs[n_iovs].iov_len = string_length;
   n_iovs++;

   if (writev (fd, iovs, n_iovs) < 0)
     ;
 }

 __clib_export __clib_weak void
 os_out_of_memory (void)
 {
   os_panic ();
 }

 __clib_export __clib_weak uword
 os_get_nthreads (void)
 {
   return 1;
 }

 __clib_export clib_bitmap_t *
 os_get_online_cpu_core_bitmap ()
 {
 #if __linux__
   return clib_sysfs_read_bitmap ("/sys/devices/system/cpu/online");
 #else
   return 0;
 #endif
 }

 __clib_export clib_bitmap_t *
 os_get_cpu_affinity_bitmap (int pid)
 {
 #if __linux
   int index, ret;
   cpu_set_t cpuset;
   uword *affinity_cpus;

   clib_bitmap_alloc (affinity_cpus, sizeof (cpu_set_t));
   clib_bitmap_zero (affinity_cpus);

   CPU_ZERO_S (sizeof (cpu_set_t), &cpuset);

   ret = sched_getaffinity (0, sizeof (cpu_set_t), &cpuset);

   if (ret < 0)
     {
       clib_bitmap_free (affinity_cpus);
       return 0;
     }

   for (index = 0; index < sizeof (cpu_set_t); index++)
     if (CPU_ISSET_S (index, sizeof (cpu_set_t), &cpuset))
       clib_bitmap_set (affinity_cpus, index, 1);
   return affinity_cpus;
 #elif defined(__FreeBSD__)
   cpuset_t mask;
   uword *r = NULL;

   if (cpuset_getaffinity (CPU_LEVEL_CPUSET, CPU_WHICH_CPUSET, -1,
 			  sizeof (mask), &mask) != 0)
     {
       clib_bitmap_free (r);
       return NULL;
     }

   for (int bit = 0; bit < CPU_SETSIZE; bit++)
     clib_bitmap_set (r, bit, CPU_ISSET (bit, &mask));

   return r;
 #else
   return NULL;
 #endif
 }

 __clib_export clib_bitmap_t *
 os_get_online_cpu_node_bitmap ()
 {
 #if __linux__
   return clib_sysfs_read_bitmap ("/sys/devices/system/node/online");
 #elif defined(__FreeBSD__)
   domainset_t domain;
   uword *r = NULL;
   int policy;

   if (cpuset_getdomain (CPU_LEVEL_CPUSET, CPU_WHICH_CPUSET, -1,
 			sizeof (domain), &domain, &policy) != 0)
     {
       clib_bitmap_free (r);
       return NULL;
     }

   for (int bit = 0; bit < CPU_SETSIZE; bit++)
     clib_bitmap_set (r, bit, CPU_ISSET (bit, &domain));
   return r;
 #else
   return 0;
 #endif
 }
 __clib_export clib_bitmap_t *
 os_get_cpu_on_node_bitmap (int node)
 {
 #if __linux__
   return clib_sysfs_read_bitmap ("/sys/devices/system/node/node%u/cpulist",
 				 node);
 #else
   return 0;
 #endif
 }

 __clib_export clib_bitmap_t *
 os_get_cpu_with_memory_bitmap ()
 {
 #if __linux__
   return clib_sysfs_read_bitmap ("/sys/devices/system/node/has_memory");
 #else
   return 0;
 #endif
 }

 __clib_export int
 os_get_cpu_phys_core_id (int cpu_id)
 {
 #if __linux
   int core_id = -1;
   clib_error_t *err;
   u8 *p;

   p =
     format (0, "/sys/devices/system/cpu/cpu%u/topology/core_id%c", cpu_id, 0);
   err = clib_sysfs_read ((char *) p, "%d", &core_id);
   vec_free (p);
   if (err)
     {
       clib_error_free (err);
       return -1;
     }
   return core_id;
 #else
   return -1;
 #endif
 }

 __clib_export u8 *
 os_get_exec_path ()
 {
   u8 *rv = 0;
 #ifdef __linux__
   char tmp[PATH_MAX];
   ssize_t sz = readlink ("/proc/self/exe", tmp, sizeof (tmp));

   if (sz <= 0)
     return 0;
 #else
   char tmp[MAXPATHLEN];
   int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
   size_t sz = MAXPATHLEN;

   if (sysctl (mib, 4, tmp, &sz, NULL, 0) == -1)
     return 0;
 #endif
   vec_add (rv, tmp, sz);
   return rv;
 }

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* Copyright (c) 2015 Cisco and/or its affiliates.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	/*
	Copyright (c) 2005 Eliot Dresselhaus

	Permission is hereby granted, free of charge, to any person obtaining
	a copy of this software and associated documentation files (the
	"Software"), to deal in the Software without restriction, including
	without limitation the rights to use, copy, modify, merge, publish,
	distribute, sublicense, and/or sell copies of the Software, and to
	permit persons to whom the Software is furnished to do so, subject to
	the following conditions:

	The above copyright notice and this permission notice shall be
	included in all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
	LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
	OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	*/

	#ifndef _GNU_SOURCE
	#define _GNU_SOURCE
	#endif

	#include <vppinfra/error.h>
	#include <vppinfra/os.h>
	#include <vppinfra/bitmap.h>
	#include <vppinfra/unix.h>
	#include <vppinfra/format.h>
	#ifdef __linux__
	#include <vppinfra/linux/sysfs.h>
	#include <sched.h>
	#elif defined(__FreeBSD__)
	#define _WANT_FREEBSD_BITSET
	#include <sys/cdefs.h>
	#include <sys/param.h>
	#include <sys/types.h>
	#include <sys/cpuset.h>
	#include <sys/domainset.h>
	#include <sys/sysctl.h>
	#endif

	#include <sys/stat.h>
	#include <sys/types.h>
	#include <sys/uio.h> /* writev */
	#include <fcntl.h>
	#include <stdio.h> /* for sprintf */
	#include <limits.h>

	__clib_export __thread uword __os_thread_index = 0;
	__clib_export __thread uword __os_numa_index = 0;

	clib_error_t *
	clib_file_n_bytes (char file, uword result)
	{
	struct stat s;

	if (stat (file, &s) < 0)
	return clib_error_return_unix (0, "stat `%s'", file);

	if (S_ISREG (s.st_mode))
	*result = s.st_size;
	else
	*result = 0;

	return /* no error */ 0;
	}

	clib_error_t *
	clib_file_read_contents (char file, u8 result, uword n_bytes)
	{
	int fd = -1;
	uword n_done, n_left;
	clib_error_t *error = 0;
	u8 *v = result;

	if ((fd = open (file, 0)) < 0)
	return clib_error_return_unix (0, "open `%s'", file);

	n_left = n_bytes;
	n_done = 0;
	while (n_left > 0)
	{
	int n_read;
	if ((n_read = read (fd, v + n_done, n_left)) < 0)
	{
	error = clib_error_return_unix (0, "open `%s'", file);
	goto done;
	}

	/* End of file. */
	if (n_read == 0)
	break;

	n_left -= n_read;
	n_done += n_read;
	}

	if (n_left > 0)
	{
	error =
	clib_error_return (0,
	" `%s' expected to read %wd bytes; read only %wd",
	file, n_bytes, n_bytes - n_left);
	goto done;
	}

	done:
	close (fd);
	return error;
	}

	__clib_export clib_error_t *
	clib_file_contents (char file, u8 * result)
	{
	uword n_bytes;
	clib_error_t *error = 0;
	u8 *v;

	if ((error = clib_file_n_bytes (file, &n_bytes)))
	return error;

	v = 0;
	vec_resize (v, n_bytes);

	error = clib_file_read_contents (file, v, n_bytes);

	if (error)
	vec_free (v);
	else
	*result = v;

	return error;
	}

	__clib_export u8 *
	clib_file_get_resolved_basename (char *fmt, ...)
	{
	va_list va;
	char *p, buffer[PATH_MAX];
	u8 link, s = 0;
	int r;

	va_start (va, fmt);
	link = va_format (0, fmt, &va);
	va_end (va);
	vec_add1 (link, 0);

	r = readlink ((char *) link, buffer, sizeof (buffer) - 1);
	vec_free (link);

	if (r < 1)
	return 0;

	buffer[r] = 0;
	p = buffer + r - 1;
	while (p > buffer && p[-1] != '/')
	p--;

	while (p[0])
	vec_add1 (s, p++[0]);

	vec_add1 (s, 0);
	return s;
	}

	clib_error_t *
	unix_proc_file_contents (char file, u8 * result)
	{
	u8 *rv = 0;
	uword pos;
	int bytes, fd;

	/* Unfortunately, stat(/proc/XXX) returns zero... */
	fd = open (file, O_RDONLY);

	if (fd < 0)
	return clib_error_return_unix (0, "open `%s'", file);

	vec_validate (rv, 4095);
	pos = 0;
	while (1)
	{
	bytes = read (fd, rv + pos, 4096);
	if (bytes < 0)
	{
	close (fd);
	vec_free (rv);
	return clib_error_return_unix (0, "read '%s'", file);
	}

	if (bytes == 0)
	{
	vec_set_len (rv, pos);
	break;
	}
	pos += bytes;
	vec_validate (rv, pos + 4095);
	}
	*result = rv;
	close (fd);
	return 0;
	}

	__clib_export __clib_weak void
	os_panic (void)
	{
	abort ();
	}

	__clib_export __clib_weak void
	os_exit (int code)
	{
	exit (code);
	}

	__clib_export __clib_weak void
	os_puts (u8 *string, uword string_length, uword is_error)
	{
	int cpu = os_get_thread_index ();
	int nthreads = os_get_nthreads ();
	char buf[64];
	int fd = is_error ? 2 : 1;
	struct iovec iovs[2];
	int n_iovs = 0;

	if (nthreads > 1)
	{
	snprintf (buf, sizeof (buf), "%d: ", cpu);

	iovs[n_iovs].iov_base = buf;
	iovs[n_iovs].iov_len = strlen (buf);
	n_iovs++;
	}

	iovs[n_iovs].iov_base = string;
	iovs[n_iovs].iov_len = string_length;
	n_iovs++;

	if (writev (fd, iovs, n_iovs) < 0)
	;
	}

	__clib_export __clib_weak void
	os_out_of_memory (void)
	{
	os_panic ();
	}

	__clib_export __clib_weak uword
	os_get_nthreads (void)
	{
	return 1;
	}

	__clib_export clib_bitmap_t *
	os_get_online_cpu_core_bitmap ()
	{
	#if __linux__
	return clib_sysfs_read_bitmap ("/sys/devices/system/cpu/online");
	#else
	return 0;
	#endif
	}

	__clib_export clib_bitmap_t *
	os_get_cpu_affinity_bitmap (int pid)
	{
	#if __linux
	int index, ret;
	cpu_set_t cpuset;
	uword *affinity_cpus;

	clib_bitmap_alloc (affinity_cpus, sizeof (cpu_set_t));
	clib_bitmap_zero (affinity_cpus);

	CPU_ZERO_S (sizeof (cpu_set_t), &cpuset);

	ret = sched_getaffinity (0, sizeof (cpu_set_t), &cpuset);

	if (ret < 0)
	{
	clib_bitmap_free (affinity_cpus);
	return 0;
	}

	for (index = 0; index < sizeof (cpu_set_t); index++)
	if (CPU_ISSET_S (index, sizeof (cpu_set_t), &cpuset))
	clib_bitmap_set (affinity_cpus, index, 1);
	return affinity_cpus;
	#elif defined(__FreeBSD__)
	cpuset_t mask;
	uword *r = NULL;

	if (cpuset_getaffinity (CPU_LEVEL_CPUSET, CPU_WHICH_CPUSET, -1,
	sizeof (mask), &mask) != 0)
	{
	clib_bitmap_free (r);
	return NULL;
	}

	for (int bit = 0; bit < CPU_SETSIZE; bit++)
	clib_bitmap_set (r, bit, CPU_ISSET (bit, &mask));

	return r;
	#else
	return NULL;
	#endif
	}

	__clib_export clib_bitmap_t *
	os_get_online_cpu_node_bitmap ()
	{
	#if __linux__
	return clib_sysfs_read_bitmap ("/sys/devices/system/node/online");
	#elif defined(__FreeBSD__)
	domainset_t domain;
	uword *r = NULL;
	int policy;

	if (cpuset_getdomain (CPU_LEVEL_CPUSET, CPU_WHICH_CPUSET, -1,
	sizeof (domain), &domain, &policy) != 0)
	{
	clib_bitmap_free (r);
	return NULL;
	}

	for (int bit = 0; bit < CPU_SETSIZE; bit++)
	clib_bitmap_set (r, bit, CPU_ISSET (bit, &domain));
	return r;
	#else
	return 0;
	#endif
	}
	__clib_export clib_bitmap_t *
	os_get_cpu_on_node_bitmap (int node)
	{
	#if __linux__
	return clib_sysfs_read_bitmap ("/sys/devices/system/node/node%u/cpulist",
	node);
	#else
	return 0;
	#endif
	}

	__clib_export clib_bitmap_t *
	os_get_cpu_with_memory_bitmap ()
	{
	#if __linux__
	return clib_sysfs_read_bitmap ("/sys/devices/system/node/has_memory");
	#else
	return 0;
	#endif
	}

	__clib_export int
	os_get_cpu_phys_core_id (int cpu_id)
	{
	#if __linux
	int core_id = -1;
	clib_error_t *err;
	u8 *p;

	p =
	format (0, "/sys/devices/system/cpu/cpu%u/topology/core_id%c", cpu_id, 0);
	err = clib_sysfs_read ((char *) p, "%d", &core_id);
	vec_free (p);
	if (err)
	{
	clib_error_free (err);
	return -1;
	}
	return core_id;
	#else
	return -1;
	#endif
	}

	__clib_export u8 *
	os_get_exec_path ()
	{
	u8 *rv = 0;
	#ifdef __linux__
	char tmp[PATH_MAX];
	ssize_t sz = readlink ("/proc/self/exe", tmp, sizeof (tmp));

	if (sz <= 0)
	return 0;
	#else
	char tmp[MAXPATHLEN];
	int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
	size_t sz = MAXPATHLEN;

	if (sysctl (mib, 4, tmp, &sz, NULL, 0) == -1)
	return 0;
	#endif
	vec_add (rv, tmp, sz);
	return rv;
	}

	/*
	* fd.io coding-style-patch-verification: ON
	*
	* Local Variables:
	* eval: (c-set-style "gnu")
	* End:
	*/