?? getenv2.c
字號:
#include <string.h>#include <errno.h>#include <pthread.h>#include <stdlib.h>extern char **environ;pthread_mutex_t env_mutex;static pthread_once_t init_done = PTHREAD_ONCE_INIT;static voidthread_init(void){ pthread_mutexattr_t attr; pthread_mutexattr_init(&attr); pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); pthread_mutex_init(&env_mutex, &attr); pthread_mutexattr_destroy(&attr);}intgetenv_r(const char *name, char *buf, int buflen){ int i, len, olen; pthread_once(&init_done, thread_init); len = strlen(name); pthread_mutex_lock(&env_mutex); for (i = 0; environ[i] != NULL; i++) { if ((strncmp(name, environ[i], len) == 0) && (environ[i][len] == '=')) { olen = strlen(&environ[i][len+1]); if (olen >= buflen) { pthread_mutex_unlock(&env_mutex); return(ENOSPC); } strcpy(buf, &environ[i][len+1]); pthread_mutex_unlock(&env_mutex); return(0); } } pthread_mutex_unlock(&env_mutex); return(ENOENT);}?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -