Sem.rar_linux sem_linux sem.c_信号量

#include "error.h" #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <stdarg.h> /* ANSI C header file */ #include <syslog.h> /* for syslog() */ //int daemon_proc; /* set nonzero by daemon_init() */ #define MAXLINE 4096 static void err_doit(int, int, const char *, va_list); /* Nonfatal error related to system call * Print message and return */ void err_ret(const char *fmt, ...) { va_list ap; va_start(ap, fmt); err_doit(1, LOG_INFO, fmt, ap); va_end(ap); return; } void err_sys(const char *fmt, ...) { va_list ap; va_start(ap, fmt); err_doit(1, LOG_ERR, fmt, ap); va_end(ap); exit(1); } /* Fatal error related to system call * Print message, dump core, and terminate */ void err_dump(const char *fmt, ...) { va_list ap; va_start(ap, fmt); err_doit(1, LOG_ERR, fmt, ap); va_end(ap); abort(); /* dump core and terminate */ exit(1); /* shouldn't get here */ } /* Nonfatal error unrelated to system call * Print message and return */ void err_msg(const char *fmt, ...) { va_list ap; va_start(ap, fmt); err_doit(0, LOG_INFO, fmt, ap); va_end(ap); return; } /* Fatal error unrelated to system call * Print message and terminate */ void err_quit(const char *fmt, ...) { va_list ap; va_start(ap, fmt); err_doit(0, LOG_ERR, fmt, ap); va_end(ap); exit(1); } /* Print message and return to caller * Caller specifies "errnoflag" and "level" */ static void err_doit(int errnoflag, int level, const char *fmt, va_list ap) { int errno_save, n; char buf[MAXLINE + 1]; errno_save = errno; /* value caller might want printed */ #ifdef HAVE_VSNPRINTF vsnprintf(buf, MAXLINE, fmt, ap); /* safe */ #else vsprintf(buf, fmt, ap); /* not safe */ #endif n = strlen(buf); if (errnoflag) snprintf(buf + n, MAXLINE - n, ": %s", strerror(errno_save)); strcat(buf, "\n"); /*if (daemon_proc) { syslog(level, buf); } else {*/ fflush(stdout); /* in case stdout and stderr are the same */ fputs(buf, stderr); fflush(stderr); //} return; }