?? error.c
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#include "unp.h"#include <stdarg.h> /* ANSI C header file */#include <syslog.h> /* for syslog() */int daemon_proc; /* set nonzero by daemon_init() */static void err_doit(int, int, const char *, va_list);/* Nonfatal error related to a system call. * Print a message and return. */voiderr_ret(const char *fmt, ...){ va_list ap; va_start(ap, fmt); err_doit(1, LOG_INFO, fmt, ap); va_end(ap); return;}/* Fatal error related to a system call. * Print a message and terminate. */voiderr_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 a system call. * Print a message, dump core, and terminate. */voiderr_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 a system call. * Print a message and return. */voiderr_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 a system call. * Print a message and terminate. */voiderr_quit(const char *fmt, ...){ va_list ap; va_start(ap, fmt); err_doit(0, LOG_ERR, fmt, ap); va_end(ap); exit(1);}/* Print a message and return to caller. * Caller specifies "errnoflag" and "level". */static voiderr_doit(int errnoflag, int level, const char *fmt, va_list ap){ int errno_save, n; char buf[MAXLINE]; errno_save = errno; /* value caller might want printed */#ifdef HAVE_VSNPRINTF vsnprintf(buf, sizeof(buf), fmt, ap); /* this is safe */#else vsprintf(buf, fmt, ap); /* this is not safe */#endif n = strlen(buf); if (errnoflag) snprintf(buf+n, sizeof(buf)-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;}
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