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Add a setproctitle() implementation

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Taken from libnostd.

Signed-off-by: Guillem Jover <guillem@hadrons.org>
This commit is contained in:
William Ahern 2012-11-28 11:09:02 +01:00 committed by Guillem Jover
parent f8d52ead5e
commit 2a0260d08c
2 changed files with 279 additions and 28 deletions
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23
COPYING
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@ -431,6 +431,29 @@ The rest of the licenses apply to code and/or man pages.
-- --
Copyright © 2010 William Ahern
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.
--
This code implements the MD5 message-digest algorithm. This code implements the MD5 message-digest algorithm.
The algorithm is due to Ron Rivest. This code was The algorithm is due to Ron Rivest. This code was
written by Colin Plumb in 1993, no copyright is claimed. written by Colin Plumb in 1993, no copyright is claimed.

284
src/setproctitle.c
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@ -1,32 +1,260 @@
/* /* ==========================================================================
* Copyright © 2010 Guillem Jover <guillem@hadrons.org> * setproctitle.c - Linux/Darwin setproctitle.
* --------------------------------------------------------------------------
* Copyright (C) 2010 William Ahern
* *
* Redistribution and use in source and binary forms, with or without * Permission is hereby granted, free of charge, to any person obtaining a
* modification, are permitted provided that the following conditions * copy of this software and associated documentation files (the
* are met: * "Software"), to deal in the Software without restriction, including
* 1. Redistributions of source code must retain the above copyright * without limitation the rights to use, copy, modify, merge, publish,
* notice, this list of conditions and the following disclaimer. * distribute, sublicense, and/or sell copies of the Software, and to permit
* 2. Redistributions in binary form must reproduce the above copyright * persons to whom the Software is furnished to do so, subject to the
* notice, this list of conditions and the following disclaimer in the * following conditions:
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * The above copyright notice and this permission notice shall be included
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * in all copies or substantial portions of the Software.
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL *
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * USE OR OTHER DEALINGS IN THE SOFTWARE.
* ==========================================================================
*/ */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
void #include <stddef.h> /* NULL size_t */
setproctitle(const char *fmt, ...) #include <stdarg.h> /* va_list va_start va_end */
{ #include <stdlib.h> /* malloc(3) setenv(3) clearenv(3) setproctitle(3) getprogname(3) */
/* Stub so that we can implement it later on and programs will #include <stdio.h> /* vsnprintf(3) snprintf(3) */
* automatically benefit from it, w/o needing to recompile. */
} #include <string.h> /* strlen(3) strchr(3) strdup(3) memset(3) memcpy(3) */
#include <errno.h> /* errno program_invocation_name program_invocation_short_name */
#if !defined(HAVE_SETPROCTITLE)
#define HAVE_SETPROCTITLE (defined __NetBSD__ || defined __FreeBSD__ || defined __OpenBSD__)
#endif
#if !HAVE_SETPROCTITLE
#if (defined __linux || defined __APPLE__) && defined __GNUC__
static struct {
/* original value */
const char *arg0;
/* title space available */
char *base, *end;
/* pointer to original nul character within base */
char *nul;
_Bool reset;
int error;
} SPT;
#ifndef SPT_MIN
#define SPT_MIN(a, b) (((a) < (b))? (a) : (b))
#endif
static inline size_t spt_min(size_t a, size_t b) {
return SPT_MIN(a, b);
} /* spt_min() */
/*
* For discussion on the portability of the various methods, see
* http://lists.freebsd.org/pipermail/freebsd-stable/2008-June/043136.html
*/
static int spt_clearenv(void) {
#if __GLIBC__
clearenv();
return 0;
#else
extern char **environ;
char **tmp;
if (!(tmp = malloc(sizeof *tmp)))
return errno;
tmp[0] = NULL;
environ = tmp;
return 0;
#endif
} /* spt_clearenv() */
static int spt_copyenv(char *oldenv[]) {
extern char **environ;
char *eq;
int i, error;
if (environ != oldenv)
return 0;
if ((error = spt_clearenv()))
goto error;
for (i = 0; oldenv[i]; i++) {
if (!(eq = strchr(oldenv[i], '=')))
continue;
*eq = '\0';
error = (0 != setenv(oldenv[i], eq + 1, 1))? errno : 0;
*eq = '=';
if (error)
goto error;
}
return 0;
error:
environ = oldenv;
return error;
} /* spt_copyenv() */
static int spt_copyargs(int argc, char *argv[]) {
char *tmp;
int i;
for (i = 1; i < argc || (i >= argc && argv[i]); i++) {
if (!argv[i])
continue;
if (!(tmp = strdup(argv[i])))
return errno;
argv[i] = tmp;
}
return 0;
} /* spt_copyargs() */
void spt_init(int argc, char *argv[], char *envp[]) __attribute__((constructor));
void spt_init(int argc, char *argv[], char *envp[]) {
char *base, *end, *nul, *tmp;
int i, error;
if (!(base = argv[0]))
return;
nul = &base[strlen(base)];
end = nul + 1;
for (i = 0; i < argc || (i >= argc && argv[i]); i++) {
if (!argv[i] || argv[i] < end)
continue;
end = argv[i] + strlen(argv[i]) + 1;
}
for (i = 0; envp[i]; i++) {
if (envp[i] < end)
continue;
end = envp[i] + strlen(envp[i]) + 1;
}
if (!(SPT.arg0 = strdup(argv[0])))
goto syerr;
#if __GLIBC__
if (!(tmp = strdup(program_invocation_name)))
goto syerr;
program_invocation_name = tmp;
if (!(tmp = strdup(program_invocation_short_name)))
goto syerr;
program_invocation_short_name = tmp;
#elif __APPLE__
if (!(tmp = strdup(getprogname())))
goto syerr;
setprogname(tmp);
#endif
if ((error = spt_copyenv(envp)))
goto error;
if ((error = spt_copyargs(argc, argv)))
goto error;
SPT.nul = nul;
SPT.base = base;
SPT.end = end;
return;
syerr:
error = errno;
error:
SPT.error = error;
} /* spt_init() */
#ifndef SPT_MAXTITLE
#define SPT_MAXTITLE 255
#endif
void setproctitle(const char *fmt, ...) {
char buf[SPT_MAXTITLE + 1]; /* use buffer in case argv[0] is passed */
va_list ap;
char *nul;
int len, error;
if (!SPT.base)
return;
if (fmt) {
va_start(ap, fmt);
len = vsnprintf(buf, sizeof buf, fmt, ap);
va_end(ap);
} else {
len = snprintf(buf, sizeof buf, "%s", SPT.arg0);
}
if (len <= 0)
{ error = errno; goto error; }
if (!SPT.reset) {
memset(SPT.base, 0, SPT.end - SPT.base);
SPT.reset = 1;
} else {
memset(SPT.base, 0, spt_min(sizeof buf, SPT.end - SPT.base));
}
len = spt_min(len, spt_min(sizeof buf, SPT.end - SPT.base) - 1);
memcpy(SPT.base, buf, len);
nul = &SPT.base[len];
if (nul < SPT.nul) {
*SPT.nul = '.';
} else if (nul == SPT.nul && &nul[1] < SPT.end) {
*SPT.nul = ' ';
*++nul = '\0';
}
return;
error:
SPT.error = error;
} /* setproctitle() */
#endif /* __linux || __APPLE__ */
#endif /* !HAVE_SETPROCTITLE */