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Hash :
6ca831b0
Author :
Date :
2025-09-16T18:57:41
stringeq: prefer memeq to memcmp in other modules * lib/argmatch.c, lib/argmatch.h, lib/backupfile.c, lib/bcp47.c: * lib/boot-time.c, lib/csharpcomp.c, lib/csharpexec.c: * lib/file-has-acl.c, lib/gen-uni-tables.c, lib/get_ppid_of.c: * lib/get_progname_of.c, lib/getlogin_r.c, lib/getprogname.c: * lib/getumask.c, lib/isnan.c, lib/mbchar.h, lib/mem-hash-map.c: * lib/memcoll.c, lib/progname.c, lib/progreloc.c: * lib/pthread_sigmask.c, lib/quotearg.c, lib/readutmp.c: * lib/same.c, lib/signbitd.c, lib/signbitf.c, lib/signbitl.c: * lib/string-desc.c, lib/string.c, lib/string.in.h: * lib/unictype/3level.h, lib/unictype/3levelbit.h: * lib/uniname/uniname.c, lib/vc-mtime.c: Prefer memeq to memcmp when either will do. Do not make this change to files shared with glibc. Do not make the change to test files, at least not for now. * lib/gen-uni-tables.c (memeq): New static function, in same style. * modules/argmatch, modules/backupfile, modules/bcp47: * modules/boot-time, modules/csharpcomp, modules/csharpexec: * modules/file-has-acl: * modules/get_ppid_of, modules/get_progname_of: * modules/getlogin_r, modules/getprogname, modules/getumask: * modules/isnan, modules/mbchar, modules/mem-hash-map: * modules/memcoll, modules/progname, modules/pthread_sigmask: * modules/quotearg, modules/readutmp, modules/relocatable-prog: * modules/relocatable-prog-wrapper, modules/same, modules/signbit: * modules/string-desc, modules/stringeq, modules/uniname/uniname: * modules/vc-mtime: (Depends-on): Add stringeq.
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/* Determine the program name of a given process.
Copyright (C) 2016-2025 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2019.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This file 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. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "get_progname_of.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined __linux__ || defined __ANDROID__ || (defined __FreeBSD_kernel__ && !defined __FreeBSD__) || defined __gnu_hurd__ || defined __NetBSD__ || defined __FreeBSD__ /* Linux, GNU/kFreeBSD, GNU/Hurd, NetBSD, FreeBSD */
# include <unistd.h>
# if defined __ANDROID__
# include <fcntl.h>
# endif
#endif
#if defined __minix || defined __sun /* Minix, Solaris */
# include <fcntl.h>
# include <unistd.h>
#endif
#if defined __OpenBSD__ /* OpenBSD */
# include <sys/sysctl.h> /* sysctl, struct kinfo_proc */
#endif
#if defined __APPLE__ && defined __MACH__ /* Mac OS X */
/* Get MAC_OS_X_VERSION_MIN_REQUIRED, MAC_OS_X_VERSION_MAX_ALLOWED.
The version at runtime satisfies
MAC_OS_X_VERSION_MIN_REQUIRED <= version <= MAC_OS_X_VERSION_MAX_ALLOWED. */
# include <AvailabilityMacros.h>
# if MAC_OS_X_VERSION_MAX_ALLOWED >= 1050
# include <libproc.h>
# if MAC_OS_X_VERSION_MIN_REQUIRED < 1050
/* Mac OS X versions < 10.5 don't have this function. Therefore declare it as
weak, in order to avoid a runtime error when the binaries are run on these
older versions. */
extern int proc_pidinfo (int, int, uint64_t, void *, int) WEAK_IMPORT_ATTRIBUTE;
# endif
# endif
#endif
#if defined _AIX /* AIX */
# include <procinfo.h>
#endif
#if defined __hpux /* HP-UX */
# include <unistd.h>
# include <sys/param.h>
# include <sys/pstat.h>
#endif
#if defined __CYGWIN__ /* Cygwin */
# define WIN32_LEAN_AND_MEAN
# include <windows.h> /* needed to get 'struct external_pinfo' defined */
# include <sys/cygwin.h>
#endif
#if defined __BEOS__ || defined __HAIKU__ /* BeOS, Haiku */
# include <OS.h>
#endif
char *
get_progname_of (pid_t pid)
{
#if defined __linux__ || defined __ANDROID__ || (defined __FreeBSD_kernel__ && !defined __FreeBSD__) || defined __gnu_hurd__ || defined __NetBSD__ /* Linux, GNU/kFreeBSD, GNU/Hurd, NetBSD */
/* GNU/kFreeBSD mounts /proc as linprocfs, which looks like a Linux /proc
file system. */
/* Read the symlink /proc/<pid>/exe. */
{
char filename[6 + 10 + 4 + 1];
char linkbuf[1024 + 1];
ssize_t linklen;
sprintf (filename, "/proc/%u/exe", (unsigned int) pid);
linklen = readlink (filename, linkbuf, sizeof (linkbuf) - 1);
if (linklen > 0)
{
char *slash;
/* NUL-terminate the link. */
linkbuf[linklen] = '\0';
/* Find the portion after the last slash. */
slash = strrchr (linkbuf, '/');
return strdup (slash != NULL ? slash + 1 : linkbuf);
}
}
# if defined __ANDROID__
/* But it may fail with "Permission denied". As a fallback,
read the contents of /proc/<pid>/cmdline into memory. */
{
char filename[6 + 10 + 8 + 1];
int fd;
sprintf (filename, "/proc/%u/cmdline", (unsigned int) pid);
fd = open (filename, O_RDONLY | O_CLOEXEC);
if (fd >= 0)
{
char buf[4096 + 1];
ssize_t nread = read (fd, buf, sizeof (buf) - 1);
close (fd);
if (nread >= 0)
{
char *slash;
/* NUL-terminate the buffer (just in case it does not have the
expected format). */
buf[nread] = '\0';
/* The program name and each argument is followed by a NUL byte. */
/* Find the portion after the last slash. */
slash = strrchr (buf, '/');
return strdup (slash != NULL ? slash + 1 : buf);
}
}
}
# endif
#endif
#if defined __FreeBSD__ /* FreeBSD */
/* Read the symlink /proc/<pid>/file. */
char filename[6 + 10 + 5 + 1];
char linkbuf[1024 + 1];
ssize_t linklen;
sprintf (filename, "/proc/%u/file", (unsigned int) pid);
linklen = readlink (filename, linkbuf, sizeof (linkbuf) - 1);
if (linklen > 0)
{
char *slash;
/* NUL-terminate the link. */
linkbuf[linklen] = '\0';
/* Find the portion after the last slash. */
slash = strrchr (linkbuf, '/');
return strdup (slash != NULL ? slash + 1 : linkbuf);
}
#endif
#if defined __minix /* Minix */
/* Read the contents of /proc/<pid>/psinfo into memory. */
char filename[6 + 10 + 7 + 1];
int fd;
sprintf (filename, "/proc/%u/psinfo", (unsigned int) pid);
fd = open (filename, O_RDONLY | O_CLOEXEC);
if (fd >= 0)
{
char buf[4096 + 1];
ssize_t nread = read (fd, buf, sizeof (buf) - 1);
close (fd);
if (nread >= 0)
{
char *p;
int count;
/* NUL-terminate the buffer. */
buf[nread] = '\0';
/* Search for the 4th space-separated field. */
p = strchr (buf, ' ');
for (count = 1; p != NULL && count < 3; count++)
p = strchr (p + 1, ' ');
if (p != NULL)
{
char *start = p + 1;
char *end = strchr (p + 1, ' ');
if (end != NULL)
{
*end = '\0';
return strdup (start);
}
}
}
}
#endif
#if defined __sun /* Solaris */
/* Read the symlink /proc/<pid>/path/a.out.
When it succeeds, it doesn't truncate. */
{
char filename[6 + 10 + 11 + 1];
char linkbuf[1024 + 1];
ssize_t linklen;
sprintf (filename, "/proc/%u/path/a.out", (unsigned int) pid);
linklen = readlink (filename, linkbuf, sizeof (linkbuf) - 1);
if (linklen > 0)
{
char *slash;
/* NUL-terminate the link. */
linkbuf[linklen] = '\0';
/* Find the portion after the last slash. */
slash = strrchr (linkbuf, '/');
return strdup (slash != NULL ? slash + 1 : linkbuf);
}
}
/* But it may fail with "Permission denied". As a fallback,
read the contents of /proc/<pid>/psinfo into memory.
Alternatively, we could read the contents of /proc/<pid>/status into
memory. But it contains a lot of information that we don't need. */
{
char filename[6 + 10 + 7 + 1];
int fd;
sprintf (filename, "/proc/%u/psinfo", (unsigned int) pid);
fd = open (filename, O_RDONLY | O_CLOEXEC);
if (fd >= 0)
{
/* The contents is a 'struct psinfo'. But since 'struct psinfo'
has a different size in a 32-bit and a 64-bit environment, we
avoid it. Nevertheless, the size of this contents depends on
whether the process that reads it is 32-bit or 64-bit! */
#if defined __LP64__
# define PSINFO_SIZE 416
# define PSINFO_FNAME_OFFSET 136
#else
# define PSINFO_SIZE 336
# define PSINFO_FNAME_OFFSET 88
#endif
char buf[PSINFO_SIZE];
ssize_t nread = read (fd, buf, sizeof (buf));
close (fd);
if (nread >= PSINFO_FNAME_OFFSET + 16)
{
/* Make sure it's NUL-terminated. */
buf[PSINFO_FNAME_OFFSET + 16] = '\0';
return strdup (&buf[PSINFO_FNAME_OFFSET]);
}
}
}
#endif
#if defined __OpenBSD__ /* OpenBSD */
/* Documentation: https://man.openbsd.org/sysctl.2 */
int info_path[] =
{ CTL_KERN, KERN_PROC, KERN_PROC_PID, pid, sizeof (struct kinfo_proc), 1 };
struct kinfo_proc info;
size_t len;
len = sizeof (info);
if (sysctl (info_path, 6, &info, &len, NULL, 0) >= 0 && len == sizeof (info))
return strdup (info.p_comm);
#endif
#if defined __APPLE__ && defined __MACH__ /* Mac OS X */
# if MAC_OS_X_VERSION_MAX_ALLOWED >= 1050
/* Mac OS X >= 10.7 has PROC_PIDT_SHORTBSDINFO. */
# if defined PROC_PIDT_SHORTBSDINFO
# if MAC_OS_X_VERSION_MIN_REQUIRED < 1050
if (proc_pidinfo != NULL) /* at runtime Mac OS X >= 10.5 ? */
# endif
{
struct proc_bsdshortinfo info;
if (proc_pidinfo (pid, PROC_PIDT_SHORTBSDINFO, 0, &info, sizeof (info))
== sizeof (info))
return strdup (info.pbsi_comm);
}
# endif
# if MAC_OS_X_VERSION_MIN_REQUIRED < 1070
/* For older versions, use PROC_PIDTBSDINFO instead. */
/* Note: The second part of 'struct proc_bsdinfo' differs in size between
32-bit and 64-bit environments, and the kernel of Mac OS X 10.5 knows
only about the 32-bit 'struct proc_bsdinfo'. Fortunately all the info
we need is in the first part, which is the same in 32-bit and 64-bit. */
# if MAC_OS_X_VERSION_MIN_REQUIRED < 1050
if (proc_pidinfo != NULL) /* at runtime Mac OS X >= 10.5 ? */
# endif
{
struct proc_bsdinfo info;
if (proc_pidinfo (pid, PROC_PIDTBSDINFO, 0, &info, 128) == 128)
return strdup (info.pbi_comm);
}
# endif
# endif
#endif
#if defined _AIX /* AIX */
/* Reference: https://www.ibm.com/support/knowledgecenter/en/ssw_aix_61/com.ibm.aix.basetrf1/getprocs.htm
*/
struct procentry64 procs;
if (getprocs64 (&procs, sizeof procs, NULL, 0, &pid, 1) > 0)
return strdup (procs.pi_comm);
#endif
#if defined __hpux /* HP-UX */
char *p;
struct pst_status status;
if (pstat_getproc (&status, sizeof status, 0, pid) > 0)
{
char *ucomm = status.pst_ucomm;
char *cmd = status.pst_cmd;
if (strlen (ucomm) < PST_UCOMMLEN - 1)
p = ucomm;
else
{
/* ucomm is truncated to length PST_UCOMMLEN - 1.
Look at cmd instead. */
char *space = strchr (cmd, ' ');
if (space != NULL)
*space = '\0';
p = strrchr (cmd, '/');
if (p != NULL)
p++;
else
p = cmd;
if (strlen (p) > PST_UCOMMLEN - 1
&& memeq (p, ucomm, PST_UCOMMLEN - 1))
/* p is less truncated than ucomm. */
;
else
p = ucomm;
}
p = strdup (p);
}
else
{
# if !defined __LP64__
/* Support for 32-bit programs running in 64-bit HP-UX.
The documented way to do this is to use the same source code
as above, but in a compilation unit where '#define _PSTAT64 1'
is in effect. I prefer a single compilation unit; the struct
size and the offsets are not going to change. */
char status64[1216];
if (__pstat_getproc64 (status64, sizeof status64, 0, pid) > 0)
{
char *ucomm = status64 + 288;
char *cmd = status64 + 168;
if (strlen (ucomm) < PST_UCOMMLEN - 1)
p = ucomm;
else
{
/* ucomm is truncated to length PST_UCOMMLEN - 1.
Look at cmd instead. */
char *space = strchr (cmd, ' ');
if (space != NULL)
*space = '\0';
p = strrchr (cmd, '/');
if (p != NULL)
p++;
else
p = cmd;
if (strlen (p) > PST_UCOMMLEN - 1
&& memeq (p, ucomm, PST_UCOMMLEN - 1))
/* p is less truncated than ucomm. */
;
else
p = ucomm;
}
p = strdup (p);
}
else
# endif
p = NULL;
}
if (p != NULL)
return strdup (p);
#endif
#if defined __CYGWIN__ /* Cygwin */
struct external_pinfo *info =
(struct external_pinfo *) cygwin_internal (CW_GETPINFO, pid);
if (info != NULL)
{
const char *name = info->progname;
size_t namesize = sizeof (info->progname);
/* It may not be NUL-terminated. */
const char *namenul = memchr (name, '\0', namesize);
size_t namelen = namenul ? namenul - name : namesize;
/* Find the portion after the last backslash.
Cygwin does not have memrchr(). */
{
const char *backslash = memchr (name, '\\', namelen);
if (backslash != NULL)
{
const char *name_end = name + namelen;
for (;;)
{
const char *next_backslash =
memchr (backslash + 1, '\\', name_end - (backslash + 1));
if (next_backslash == NULL)
break;
backslash = next_backslash;
}
name = backslash + 1;
namelen = name_end - name;
}
}
{
char *namecopy = malloc (namelen + 1);
if (namecopy)
{
namecopy[namelen] = '\0';
return memcpy (namecopy, name, namelen);
}
}
}
#endif
#if defined __BEOS__ || defined __HAIKU__ /* BeOS, Haiku */
team_info info;
if (_get_team_info (pid, &info, sizeof (info)) == B_OK)
{
const char *name = info.args;
size_t namesize = sizeof (info.args);
/* It may not be NUL-terminated. */
const char *namenul = memchr (name, '\0', namesize);
size_t namelen = namenul ? namenul - name : namesize;
/* Take the portion up to the first space. */
{
const char *space = memchr (name, ' ', namelen);
if (space != NULL)
namelen = space - name;
}
/* Find the portion after the last slash. */
{
const char *slash = memchr (name, '/', namelen);
if (slash != NULL)
{
const char *name_end = name + namelen;
for (;;)
{
const char *next_slash =
memchr (slash + 1, '/', name_end - (slash + 1));
if (next_slash == NULL)
break;
slash = next_slash;
}
name = slash + 1;
namelen = name_end - name;
}
}
{
char *namecopy = malloc (namelen + 1);
if (namecopy)
{
namecopy[namelen] = '\0';
return memcpy (namecopy, name, namelen);
}
}
}
#endif
return NULL;
}
#ifdef TEST
#include <stdlib.h>
#include <unistd.h>
/* Usage: ./a.out
or: ./a.out PID
*/
int
main (int argc, char *argv[])
{
char *arg = argv[1];
pid_t pid = (arg != NULL ? atoi (arg) : getpid ());
char *progname = get_progname_of (pid);
printf ("PID=%lu COMMAND=%s\n",
(unsigned long) pid, progname != NULL ? progname : "(null)");
free (progname);
return 0;
}
/*
* Local Variables:
* compile-command: "gcc -ggdb -DTEST -Wall -I.. get_progname_of.c"
* End:
*/
#endif