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libfastcommon/src/system_info.c

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/*
* Copyright (c) 2020 YuQing <384681@qq.com>
*
* This program is free software: you can use, redistribute, and/or modify
* it under the terms of the Lesser GNU General Public License, version 3
* or later ("LGPL"), as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the Lesser GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <signal.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <errno.h>
#include <dirent.h>
#include "logger.h"
#include "shared_func.h"
#include "fc_memory.h"
#include "system_info.h"
#ifdef OS_LINUX
#include <sys/sysinfo.h>
#include <sys/vfs.h>
#include <sys/sysmacros.h>
#else
#ifdef OS_FREEBSD
#include <sys/sysctl.h>
#include <sys/ucred.h>
#if HAVE_USER_H == 1
#include <sys/user.h>
#endif
#if HAVE_VMMETER_H == 1
#include <sys/vmmeter.h>
#endif
#endif
#endif
int get_sys_total_mem_size(int64_t *mem_size)
{
#ifdef OS_LINUX
struct sysinfo si;
if (sysinfo(&si) != 0)
{
logError("file: "__FILE__", line: %d, " \
"call sysinfo fail, " \
"errno: %d, error info: %s", \
__LINE__, errno, STRERROR(errno));
return errno != 0 ? errno : EPERM;
}
*mem_size = si.totalram;
return 0;
#elif defined(OS_FREEBSD)
int mib[2];
size_t len;
mib[0] = CTL_HW;
mib[1] = HW_MEMSIZE;
len = sizeof(*mem_size);
if (sysctl(mib, 2, mem_size, &len, NULL, 0) != 0)
{
logError("file: "__FILE__", line: %d, " \
"call sysctl fail, " \
"errno: %d, error info: %s", \
__LINE__, errno, STRERROR(errno));
return errno != 0 ? errno : EPERM;
}
return 0;
#else
*mem_size = 0;
logError("file: "__FILE__", line: %d, "
"please port me!", __LINE__);
return EOPNOTSUPP;
#endif
}
int get_sys_cpu_count()
{
#if defined(OS_LINUX) || defined(OS_FREEBSD)
return sysconf(_SC_NPROCESSORS_ONLN);
#else
logError("file: "__FILE__", line: %d, "
"please port me!", __LINE__);
return 0;
#endif
}
#define TIMEVAL_TO_SECONDS(tv) \
((double)tv.tv_sec + (double)tv.tv_usec / 1000000.00)
#define SECONDS_TO_TIMEVAL(secs, tv) \
do { \
(tv).tv_sec = (time_t)secs; \
(tv).tv_usec = (secs - (tv).tv_sec) * 1000000; \
} while (0)
int get_boot_time(struct timeval *boot_time)
{
#ifdef OS_LINUX
char buff[256];
int64_t bytes;
struct sysinfo si;
bytes = sizeof(buff);
if (getFileContentEx("/proc/uptime", buff, 0, &bytes) == 0)
{
double uptime;
double btime;
struct timeval current_time;
if (sscanf(buff, "%lf", &uptime) == 1)
{
gettimeofday(&current_time, NULL);
btime = TIMEVAL_TO_SECONDS(current_time) - uptime;
SECONDS_TO_TIMEVAL(btime, *boot_time);
boot_time->tv_usec = 0;
return 0;
}
}
if (sysinfo(&si) != 0)
{
logError("file: "__FILE__", line: %d, "
"call sysinfo fail, "
"errno: %d, error info: %s",
__LINE__, errno, STRERROR(errno));
return errno != 0 ? errno : EPERM;
}
boot_time->tv_sec = time(NULL) - si.uptime;
boot_time->tv_usec = 0;
return 0;
#elif defined(OS_FREEBSD)
size_t size;
int mib[2];
mib[0] = CTL_KERN;
mib[1] = KERN_BOOTTIME;
size = sizeof(struct timeval);
if (sysctl(mib, 2, boot_time, &size, NULL, 0) == 0)
{
return 0;
}
else
{
boot_time->tv_sec = 0;
boot_time->tv_usec = 0;
logError("file: "__FILE__", line: %d, "
"call sysctl fail, "
"errno: %d, error info: %s",
__LINE__, errno, STRERROR(errno));
return errno != 0 ? errno : EPERM;
}
#else
boot_time->tv_sec = 0;
boot_time->tv_usec = 0;
logError("file: "__FILE__", line: %d, "
"please port me!", __LINE__);
return EOPNOTSUPP;
#endif
}
#define SET_STATFS_FIELDS(left, right) \
do { \
left.f_type = right.f_type; \
left.f_bsize = right.f_bsize; \
left.f_blocks = right.f_blocks; \
left.f_bfree = right.f_bfree; \
left.f_bavail = right.f_bavail; \
left.f_files = right.f_files; \
left.f_ffree = right.f_ffree; \
} while (0)
#define SET_MNT_FIELDS(left, fstypename, mntfromname, mntonname) \
do { \
snprintf(left.f_fstypename, sizeof(left.f_fstypename), "%s", fstypename); \
snprintf(left.f_mntfromname, sizeof(left.f_mntfromname), "%s", mntfromname); \
snprintf(left.f_mntonname, sizeof(left.f_mntonname), "%s", mntonname); \
} while (0)
int get_mounted_filesystems(struct fast_statfs *stats,
const int size, int *count)
{
#ifdef OS_LINUX
const char *filename = "/proc/mounts";
FILE *fp;
char *p;
char *mntfromname;
char *mntonname;
char *fstypename;
struct statfs buf;
char line[1024];
int result;
int i;
*count = 0;
fp = fopen(filename, "r");
if (fp == NULL)
{
result = errno != 0 ? errno : ENOENT;
logError("file: "__FILE__", line: %d, "
"call fopen %s fail, "
"errno: %d, error info: %s",
__LINE__, filename, errno, STRERROR(errno));
return result;
}
memset(stats, 0, sizeof(struct fast_statfs) * size);
result = 0;
while (fgets(line, sizeof(line), fp) != NULL)
{
if (*count >= size)
{
result = ENOSPC;
break;
}
p = line;
mntfromname = strsep(&p, " \t");
mntonname = strsep(&p, " \t");
fstypename = strsep(&p, " \t");
snprintf(stats[*count].f_mntfromname,
sizeof(stats[*count].f_mntfromname), "%s", mntfromname);
snprintf(stats[*count].f_mntonname,
sizeof(stats[*count].f_mntonname), "%s", mntonname);
snprintf(stats[*count].f_fstypename,
sizeof(stats[*count].f_fstypename), "%s", fstypename);
(*count)++;
}
fclose(fp);
for (i=0; i<*count; i++)
{
if (statfs(stats[i].f_mntonname, &buf) == 0)
{
SET_STATFS_FIELDS(stats[i], buf);
#ifdef HAVE_FILE_SYSTEM_ID
stats[i].f_fsid = buf.f_fsid;
#endif
}
else
{
logWarning("file: "__FILE__", line: %d, "
"call statfs fail, "
"errno: %d, error info: %s",
__LINE__, errno, STRERROR(errno));
}
}
return result;
#elif defined(OS_FREEBSD)
struct statfs *mnts;
int result;
int i;
mnts = NULL;
*count = getmntinfo(&mnts, 0);
if (*count == 0)
{
result = errno != 0 ? errno : EPERM;
logError("file: "__FILE__", line: %d, "
"call getmntinfo fail, "
"errno: %d, error info: %s",
__LINE__, errno, STRERROR(errno));
return result;
}
if (*count <= size)
{
result = 0;
}
else
{
*count = size;
result = ENOSPC;
}
for (i=0; i<*count; i++)
{
SET_STATFS_FIELDS(stats[i], mnts[i]);
#ifdef HAVE_FILE_SYSTEM_ID
stats[i].f_fsid = mnts[i].f_fsid;
#endif
SET_MNT_FIELDS(stats[i], mnts[i].f_fstypename,
mnts[i].f_mntfromname, mnts[i].f_mntonname);
}
return result;
#else
*count = 0;
logError("file: "__FILE__", line: %d, "
"please port me!", __LINE__);
return EOPNOTSUPP;
#endif
}
#if defined(OS_LINUX) || defined(OS_FREEBSD)
typedef struct fast_process_array {
struct fast_process_info *procs;
int alloc_size;
int count;
} FastProcessArray;
#if defined(OS_LINUX)
static int check_process_capacity(FastProcessArray *proc_array)
{
struct fast_process_info *procs;
int alloc_size;
int bytes;
if (proc_array->alloc_size > proc_array->count)
{
return 0;
}
alloc_size = proc_array->alloc_size > 0 ?
proc_array->alloc_size * 2 : 128;
bytes = sizeof(struct fast_process_info) * alloc_size;
procs = (struct fast_process_info *)fc_malloc(bytes);
if (procs == NULL)
{
return ENOMEM;
}
memset(procs, 0, bytes);
if (proc_array->count > 0)
{
memcpy(procs, proc_array->procs, sizeof(struct fast_process_info) *
proc_array->count);
free(proc_array->procs);
}
proc_array->alloc_size = alloc_size;
proc_array->procs = procs;
return 0;
}
static void parse_proc_stat(char *buff, const int len,
struct fast_process_info *process, unsigned long long *starttime)
{
char *p;
char *end;
char *start;
int cmd_len;
if (len == 0)
{
process->field_count = 0;
return;
}
end = buff + len;
process->pid = strtol(buff, &p, 10);
p++; //skip space
start = p;
while (p < end)
{
if (*p == ' ' || *p == '\t')
{
if (*start == '(')
{
if (*(p - 1) == ')')
{
break;
}
}
else
{
break;
}
}
p++;
}
if (p == end)
{
process->field_count = 1;
return;
}
if (*start == '(')
{
start++;
cmd_len = p - start - 1;
}
else
{
cmd_len = p - start;
}
if (cmd_len >= sizeof(process->comm))
{
cmd_len = sizeof(process->comm) - 1;
}
memcpy(process->comm, start, cmd_len);
p++; //skip space
process->field_count = 2 +
sscanf(p, "%c %d %d %d %d %d %u %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld "
"%ld %ld %llu %lu %ld %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu "
"%lu %lu %d %d %u %u %llu %lu %ld",
&process->state,
&process->ppid,
&process->pgrp,
&process->session,
&process->tty_nr,
&process->tpgid,
&process->flags,
&process->minflt,
&process->cminflt,
&process->majflt,
&process->cmajflt,
&process->utime,
&process->stime,
&process->cutime,
&process->cstime,
&process->priority,
&process->nice,
&process->num_threads,
&process->itrealvalue,
starttime,
&process->vsize,
&process->rss,
&process->rsslim,
&process->startcode,
&process->endcode,
&process->startstack,
&process->kstkesp,
&process->kstkeip,
&process->signal,
&process->blocked,
&process->sigignore,
&process->sigcatch,
&process->wchan,
&process->nswap,
&process->cnswap,
&process->exit_signal,
&process->processor,
&process->rt_priority,
&process->policy,
&process->delayacct_blkio_ticks,
&process->guest_time,
&process->cguest_time);
}
int get_processes(struct fast_process_info **processes, int *count)
{
const char *dirname = "/proc";
char filename[128];
char buff[4096];
DIR *dir;
struct timeval boot_time;
struct dirent *ent;
FastProcessArray proc_array;
int64_t bytes;
unsigned long long starttime;
int tickets;
int result;
int len;
int i;
tickets = sysconf(_SC_CLK_TCK);
if (tickets == 0)
{
tickets = 100;
}
dir = opendir(dirname);
if (dir == NULL)
{
*count = 0;
*processes = NULL;
logError("file: "__FILE__", line: %d, "
"call opendir %s fail, "
"errno: %d, error info: %s",
__LINE__, dirname, errno, STRERROR(errno));
return errno != 0 ? errno : EPERM;
}
result = 0;
proc_array.procs = NULL;
proc_array.alloc_size = 0;
proc_array.count = 0;
while ((ent=readdir(dir)) != NULL)
{
len = strlen(ent->d_name);
for (i=0; i<len; i++)
{
if (!(ent->d_name[i] >= '0' && ent->d_name[i] <= '9'))
{
break;
}
}
if (i < len) //not digital string
{
continue;
}
if ((result=check_process_capacity(&proc_array)) != 0)
{
break;
}
sprintf(filename, "%s/%s/stat", dirname, ent->d_name);
bytes = sizeof(buff);
if (getFileContentEx(filename, buff, 0, &bytes) != 0)
{
continue;
}
get_boot_time(&boot_time);
parse_proc_stat(buff, bytes, proc_array.procs + proc_array.count,
&starttime);
SECONDS_TO_TIMEVAL(TIMEVAL_TO_SECONDS(boot_time) +
(double)starttime / (double)tickets,
proc_array.procs[proc_array.count].starttime);
proc_array.procs[proc_array.count].starttime.tv_usec = 0;
proc_array.count++;
}
closedir(dir);
*count = proc_array.count;
*processes = proc_array.procs;
return result;
}
int get_sysinfo(struct fast_sysinfo *info)
{
struct sysinfo si;
get_boot_time(&info->boot_time);
if (sysinfo(&si) != 0)
{
logError("file: "__FILE__", line: %d, " \
"call sysinfo fail, " \
"errno: %d, error info: %s", \
__LINE__, errno, STRERROR(errno));
return errno != 0 ? errno : EPERM;
}
info->loads[0] = si.loads[0] / (double)(1 << SI_LOAD_SHIFT);
info->loads[1] = si.loads[1] / (double)(1 << SI_LOAD_SHIFT),
info->loads[2] = si.loads[2] / (double)(1 << SI_LOAD_SHIFT);
info->totalram = si.totalram;
info->freeram = si.freeram;
info->sharedram = si.sharedram;
info->bufferram = si.bufferram;
info->totalswap = si.totalswap;
info->freeswap = si.freeswap;
info->procs = si.procs;
return 0;
}
#elif defined(OS_FREEBSD)
#ifdef DARWIN
#define ki_pid kp_proc.p_pid
#define ki_comm kp_proc.p_comm
#define ki_ppid kp_eproc.e_ppid
#define ki_start kp_proc.p_starttime
#define ki_flag kp_proc.p_flag
#define ki_stat kp_proc.p_stat
#define ki_sigignore kp_proc.p_sigignore
#define ki_sigcatch kp_proc.p_sigcatch
#define ki_priority kp_proc.p_priority
#define ki_ruid kp_eproc.e_pcred.p_ruid
#define ki_rgid kp_eproc.e_pcred.p_rgid
#define GET_SIGNAL(sig) sig
#else
#define ki_priority ki_pri.pri_level
#define GET_SIGNAL(sig) *((int *)&sig)
#endif
int get_processes(struct fast_process_info **processes, int *count)
{
struct kinfo_proc *procs;
struct fast_process_info *process;
int mib[4];
size_t size;
int bytes;
int nproc;
int i;
bool success;
*count = 0;
*processes = NULL;
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_ALL;
mib[3] = 0;
size = 0;
if (sysctl(mib, 4, NULL, &size, NULL, 0) < 0)
{
logError("file: "__FILE__", line: %d, " \
"call sysctl fail, " \
"errno: %d, error info: %s", \
__LINE__, errno, STRERROR(errno));
return errno != 0 ? errno : EPERM;
}
nproc = size / sizeof(struct kinfo_proc);
if (nproc == 0) {
return ENOENT;
}
success = false;
procs = NULL;
for (i=0; i<10; i++)
{
nproc += 32;
if (procs != NULL)
{
free(procs);
}
size = sizeof(struct kinfo_proc) * nproc;
procs = (struct kinfo_proc *)fc_malloc(size);
if (procs == NULL)
{
return ENOMEM;
}
if (sysctl(mib, 4, procs, &size, NULL, 0) == 0)
{
success = true;
break;
}
if (errno != ENOMEM)
{
logError("file: "__FILE__", line: %d, " \
"call sysctl fail, " \
"errno: %d, error info: %s", \
__LINE__, errno, STRERROR(errno));
free(procs);
return errno != 0 ? errno : EPERM;
}
}
if (!success)
{
free(procs);
return ENOSPC;
}
nproc = size / sizeof(struct kinfo_proc);
bytes = sizeof(struct fast_process_info) * nproc;
*processes = (struct fast_process_info *)fc_malloc(bytes);
if (*processes == NULL)
{
free(procs);
return ENOMEM;
}
memset(*processes, 0, bytes);
process = *processes;
for (i=0; i<nproc; i++)
{
process->field_count = 9;
snprintf(process->comm, sizeof(process->comm),
"%s", procs[i].ki_comm);
process->pid = procs[i].ki_pid;
process->ppid = procs[i].ki_ppid;
process->starttime = procs[i].ki_start;
process->flags = procs[i].ki_flag;
process->state = procs[i].ki_stat;
process->sigignore = GET_SIGNAL(procs[i].ki_sigignore);
process->sigcatch = GET_SIGNAL(procs[i].ki_sigcatch);
process->priority = procs[i].ki_priority;
//process->uid = procs[i].ki_ruid;
//process->gid = procs[i].ki_rgid;
process++;
}
free(procs);
*count = nproc;
return 0;
}
int get_sysinfo(struct fast_sysinfo *info)
{
int mib[4];
size_t size;
struct loadavg loads;
#if HAVE_VMMETER_H == 1
struct vmtotal vm;
#endif
#ifdef VM_SWAPUSAGE
struct xsw_usage sw_usage;
#endif
memset(info, 0, sizeof(struct fast_sysinfo));
get_boot_time(&info->boot_time);
mib[0] = CTL_VM;
mib[1] = VM_LOADAVG;
size = sizeof(loads);
if (sysctl(mib, 2, &loads, &size, NULL, 0) != 0)
{
logError("file: "__FILE__", line: %d, " \
"call sysctl fail, " \
"errno: %d, error info: %s", \
__LINE__, errno, STRERROR(errno));
}
else if (loads.fscale > 0)
{
info->loads[0] = (double)loads.ldavg[0] / loads.fscale;
info->loads[1] = (double)loads.ldavg[1] / loads.fscale;
info->loads[2] = (double)loads.ldavg[2] / loads.fscale;
}
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_ALL;
mib[3] = 0;
size = 0;
if (sysctl(mib, 4, NULL, &size, NULL, 0) != 0)
{
logError("file: "__FILE__", line: %d, " \
"call sysctl fail, " \
"errno: %d, error info: %s", \
__LINE__, errno, STRERROR(errno));
}
else
{
info->procs = size / sizeof(struct kinfo_proc);
}
get_sys_total_mem_size((int64_t *)&info->totalram);
#if HAVE_VMMETER_H == 1
mib[0] = CTL_VM;
mib[1] = VM_METER;
size = sizeof(vm);
if (sysctl(mib, 2, &vm, &size, NULL, 0) != 0)
{
logError("file: "__FILE__", line: %d, " \
"call sysctl fail, " \
"errno: %d, error info: %s", \
__LINE__, errno, STRERROR(errno));
}
else
{
int page_size;
page_size = sysconf(_SC_PAGESIZE);
info->freeram = vm.t_free * page_size;
info->sharedram = vm.t_rmshr * page_size;
}
#endif
#ifdef VM_SWAPUSAGE
mib[0] = CTL_VM;
mib[1] = VM_SWAPUSAGE;
size = sizeof(sw_usage);
if (sysctl(mib, 2, &sw_usage, &size, NULL, 0) != 0)
{
logError("file: "__FILE__", line: %d, " \
"call sysctl fail, " \
"errno: %d, error info: %s", \
__LINE__, errno, STRERROR(errno));
}
else
{
info->totalswap = sw_usage.xsu_total;
info->freeswap = sw_usage.xsu_avail;
}
#endif
return 0;
}
#endif
#endif
int get_kernel_version(Version *version)
{
struct utsname name;
char *p;
int numbers[2];
int i;
if (uname(&name) < 0)
{
logError("file: "__FILE__", line: %d, "
"call uname fail, errno: %d, error info: %s",
__LINE__, errno, STRERROR(errno));
return errno != 0 ? errno : EFAULT;
}
numbers[0] = numbers[1] = 0;
p = name.release;
for (i=0; i<2; i++) {
p = strchr(p, '.');
if (p == NULL) {
break;
}
p++;
numbers[i] = strtol(p, NULL, 10);
}
version->major = strtol(name.release, NULL, 10);
version->minor = numbers[0];
version->patch = numbers[1];
return 0;
}
#ifdef OS_LINUX
int get_device_block_size(const char *device, int *block_size)
{
int result;
int fd;
size_t bs;
if ((fd=open(device, O_RDONLY | O_CLOEXEC)) < 0) {
result = errno != 0 ? errno : ENOENT;
logError("file: "__FILE__", line: %d, "
"open device %s fail, errno: %d, error info: %s",
__LINE__, device, result, strerror(result));
return result;
}
if (ioctl(fd, BLKSSZGET, &bs) == 0) {
*block_size = bs;
result = 0;
} else {
result = errno != 0 ? errno : EPERM;
logError("file: "__FILE__", line: %d, "
"ioctl device %s fail, errno: %d, error info: %s",
__LINE__, device, result, strerror(result));
}
close(fd);
return result;
}
static int get_block_size_by_write(const char *path, int *block_size)
{
#define MAX_BLK_SIZE (128 * 1024)
char tmp_filename[PATH_MAX];
char *buff;
int result;
int fd;
if ((result=posix_memalign((void **)&buff,
MAX_BLK_SIZE, MAX_BLK_SIZE)) != 0)
{
logError("file: "__FILE__", line: %d, "
"posix_memalign %d bytes fail, "
"errno: %d, error info: %s", __LINE__,
MAX_BLK_SIZE, result, STRERROR(result));
return result;
}
snprintf(tmp_filename, sizeof(tmp_filename),
"%s/.blksize-test.tmp", path);
if ((fd=open(tmp_filename, O_WRONLY | O_CREAT |
O_DIRECT | O_CLOEXEC, 0755)) < 0)
{
result = errno != 0 ? errno : ENOENT;
logError("file: "__FILE__", line: %d, "
"open file %s fail, errno: %d, error info: %s",
__LINE__, tmp_filename, result, strerror(result));
free(buff);
return result;
}
result = EINVAL;
*block_size = 512;
while (*block_size <= MAX_BLK_SIZE) {
if (write(fd, buff, *block_size) == *block_size) {
result = 0;
break;
}
result = errno != 0 ? errno : EINTR;
if (result == EINTR) {
continue;
}
if (result != EINVAL) {
logError("file: "__FILE__", line: %d, "
"write to file %s fail, errno: %d, error info: %s",
__LINE__, tmp_filename, result, strerror(result));
break;
}
*block_size *= 2;
}
free(buff);
close(fd);
unlink(tmp_filename);
return result;
}
int get_path_block_size(const char *path, int *block_size)
{
char dev_path[64];
struct stat statbuf;
int result;
if (stat(path, &statbuf) != 0) {
result = errno != 0 ? errno : EPERM;
logError("file: "__FILE__", line: %d, "
"stat %s fail, errno: %d, error info: %s",
__LINE__, path, result, strerror(result));
return result;
}
if (S_ISBLK(statbuf.st_mode)) {
return get_device_block_size(path, block_size);
}
if (!S_ISDIR(statbuf.st_mode)) {
logError("file: "__FILE__", line: %d, "
"%s is NOT a directory!", __LINE__, path);
return ENOTDIR;
}
sprintf(dev_path, "/dev/block/%d:%d", (int)major(statbuf.st_dev),
(int)minor(statbuf.st_dev));
if (access(dev_path, R_OK) == 0) {
if ((result=get_device_block_size(dev_path, block_size)) == 0) {
return 0;
}
}
return get_block_size_by_write(path, block_size);
}
int get_groups(const pid_t pid, const gid_t gid, const int size, gid_t *list)
{
#define GROUPS_TAG_STR "\nGroups:"
#define GROUPS_TAG_LEN (sizeof(GROUPS_TAG_STR) - 1)
char filename[64];
char buff[1024];
char *p;
char *end;
int fd;
int len;
gid_t val;
int count;
sprintf(filename, "/proc/%d/status", pid);
fd = open(filename, O_RDONLY);
if (fd < 0) {
return 0;
}
len = read(fd, buff, sizeof(buff));
close(fd);
if (len <= 0) {
return 0;
}
buff[len - 1] = '\0';
if ((p=strstr(buff, GROUPS_TAG_STR)) == NULL) {
return 0;
}
p += GROUPS_TAG_LEN;
count = 0;
while (count < size) {
val = strtoul(p, &end, 10);
if (end == p) {
break;
}
if (val != gid) {
list[count++] = val;
}
p = end;
}
return count;
}
#elif defined(OS_FREEBSD)
int get_groups(const pid_t pid, const gid_t gid, const int size, gid_t *list)
{
int mibpath[4];
struct kinfo_proc kp;
size_t kplen;
int count;
int i;
#if defined(CTL_KERN) && defined(KERN_PROC) && defined(KERN_PROC_PID)
mibpath[0] = CTL_KERN;
mibpath[1] = KERN_PROC;
mibpath[2] = KERN_PROC_PID;
#else
kplen = 4;
sysctlnametomib("kern.proc.pid", mibpath, &kplen);
#endif
mibpath[3] = pid;
kplen = sizeof(kp);
memset(&kp,0,sizeof(kp));
if (sysctl(mibpath, 4, &kp, &kplen, NULL, 0) != 0) {
return 0;
}
#if defined(DARWIN)
#define ki_ngroups kp_eproc.e_ucred.cr_ngroups
#define ki_groups kp_eproc.e_ucred.cr_groups
#endif
count = 0;
for (i=0; i<kp.ki_ngroups && count<size; i++) {
if (kp.ki_groups[i] != gid) {
list[count++] = kp.ki_groups[i];
}
}
return count;
}
#endif
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