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本文实例讲述了Linux下C语言修改进程名称的方法。分享给大家供大家参考。具体如下：
#include <stdio.h>
#include <string.h>
#include "./util/setproctitle.c"
// extern char **environ;
// int main(int argc , char *argv[])
// {
// int i;
// printf("argc:%d\n" , argc);
// for (i = 0; i < argc; ++i){
// printf("0x%x\n" , argv[i]);
// printf("argv[%d]:%s\n" , i , argv[i]);
// }
// printf("evriron=%x\n" , environ[0]);
// return 0;
// }
int main(int argc, char **argv){
spt_init(argc,argv);
setproctitle("设置进程名为:this is a test");
sleep(1000);
return 0;
}
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setproctitle.c文件如下：
/* ==========================================================================
* setproctitle.c - Linux/Darwin setproctitle.
* --------------------------------------------------------------------------
* Copyright (C) 2010 William Ahern
* Copyright (C) 2013 Salvatore Sanfilippo
* Copyright (C) 2013 Stam He
*
* 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 <stddef.h> /* NULL size_t */
#include <stdarg.h> /* va_list va_start va_end */
#include <stdlib.h> /* malloc(3) setenv(3) clearenv(3) setproctitle(3) getprogname(3) */
#include <stdio.h> /* vsnprintf(3) snprintf(3) */
#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__)
extern char **environ;
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);
static int spt_clearenv(void);
static int spt_copyenv(char *oldenv[]);
static int spt_copyargs(int argc, char *argv[]) ;
void spt_init(int argc, char *argv[]);
void setproctitle(const char *fmt, ...);
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;
static 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 = environ;
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 ((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 */
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希望本文所述对大家的C语言程序设计有所帮助。
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