linux下C语言实现写日志功能

吾爱主题阅读：125 2024-04-05 13:54:30 评论：0

先上程序，该程序经过测试能够很好的实现写日志要求

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 /************************************************************************* > File Name: log.c > Author: ************************************************************************/ #include <stdio.h> #include <sys/types.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <stdarg.h> #include <time.h> #include <pthread.h> int safe_asprintf( char **strp, const char *fmt, ...); int safe_vasprintf( char **strp, const char *fmt, va_list ap); void plog( const char *format, ...) ; void pinfo( const char *format, ...) ; #define DEBUG #ifdef DEBUG void plog( const char *format, ...); void pinfo( const char *format, ...); #define debug(fmt, args...) plog(fmt, ##args) #else #define debug(fmt, args...) do{}while(0) #endif static pthread_mutex_t fileMutex = PTHREAD_MUTEX_INITIALIZER; int main( int argc, char *argv) { return 0; } /* * safe_asprintf(); */ int safe_asprintf( char **strp, const char *fmt, ...) { va_list ap; int retval; va_start (ap, fmt); retval = safe_vasprintf(strp, fmt, ap); va_end (ap); return retval; } /* * safe_vasprintf(); */ int safe_vasprintf( char **strp, const char *fmt, va_list ap) { int retval; retval = vasprintf(strp, fmt, ap); if (retval == -1) { printf ( "Failed to vasprintf: %s. Bailing out\n" , strerror ( errno )); return 1; } return retval; } /* * plog(); */ void plog( const char *format, ...) { pthread_mutex_lock(&fileMutex); FILE *fp = NULL; va_list vlist; char *fmt = NULL; // Open debug info output file. if (!(fp = fopen ( "log.txt" , "a+" ))) { pthread_mutex_unlock(&fileMutex); return ; } va_start (vlist, format); safe_vasprintf(&fmt, format, vlist); va_end (vlist); if (!fmt) { pthread_mutex_unlock(&fileMutex); return ; } time_t timep; struct tm *ptm = NULL; time (&timep); ptm = localtime (&timep); fprintf (fp, "[%04d-%02d-%02d-%02d-%02d-%02d] %s" , ptm->tm_year + 1900, ptm->tm_mon + 1, ptm->tm_mday, ptm->tm_hour, ptm->tm_min, ptm->tm_sec, fmt); free (fmt); fsync(fileno(fp)); fclose (fp); pthread_mutex_unlock(&fileMutex); } /* * pinfo(); */ void pinfo( const char *format, ...) { pthread_mutex_lock(&fileMutex); FILE *fp = NULL; va_list vlist; char *fmt = NULL; // Open debug info output file. if (!(fp = fopen ( "log.txt" , "a+" ))) { pthread_mutex_unlock(&fileMutex); return ; } va_start (vlist, format); safe_vasprintf(&fmt, format, vlist); va_end (vlist); if (!fmt) { pthread_mutex_unlock(&fileMutex); return ; } fprintf (fp, "%s" , fmt); free (fmt); fsync(fileno(fp)); fclose (fp); pthread_mutex_unlock(&fileMutex); }