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:%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 = ''; 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 = ''; } return; error: SPT.error = error; } /* setproctitle() */ #endif /* __linux || __APPLE__ */ #endif /* !HAVE_SETPROCTITLE */
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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