Linux下C语言修改进程名称的方法

#include <stdio.h>
#include <string.h>
#include "./util/setproctitle.c"
// extern char **environ;
// int main(int argc,char *argv[])
// {
// int i;
// printf("argc:%dn",argc);
// for (i = 0; i < argc; ++i){
// printf("0x%xn",argv[i]);
// printf("argv[%d]:%sn",i,argv[i]);
// }
// printf("evriron=%xn",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;
}

/* ==========================================================================
 * 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 = '';
    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,"%s",SPT.arg0);
  }
  if (len <= 0)
    { error = errno; goto error; }
  if (!SPT.reset) {
    memset(SPT.base,SPT.end - SPT.base);
    SPT.reset = 1;
  } else {
    memset(SPT.base,spt_min(sizeof buf,SPT.end - SPT.base));
  }
  len = spt_min(len,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 = '';
  }
  return;
error:
  SPT.error = error;
} /* setproctitle() */
#endif /* __linux || __APPLE__ */
#endif /* !HAVE_SETPROCTITLE */