SIG_ERR
来自cppreference.com
| 定义于头文件 <signal.h>
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| #define SIG_ERR /* implementation defined */ |
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void (*)(int) 类型值。为 signal 所返回时，指示出现了错误。
示例
运行此代码
#include <stdio.h> #include <stdlib.h> #include <signal.h> void signal_handler(int signal) { printf("Received signal %d\n", signal); } int main(void) { /* 安装信号处理函数。 */ if (signal(SIGTERM, signal_handler) == SIG_ERR) { printf("Error while installing a signal handler.\n"); exit(EXIT_FAILURE); } printf("Sending signal %d\n", SIGTERM); if (raise(SIGTERM) != 0) { printf("Error while raising the SIGTERM signal.\n"); exit(EXIT_FAILURE); } printf("Exit main()\n"); return EXIT_SUCCESS; }
输出：
Sending signal 15 Received signal 15 Exit main()
引用
- C11 standard (ISO/IEC 9899:2011):
- 7.14/3 Signal handling <signal.h> (p: 265)
- C99 standard (ISO/IEC 9899:1999):
- 7.14/3 Signal handling <signal.h> (p: 246)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.7 SIGNAL HANDLING <signal.h>
参阅
| 为特定的信号设置信号处理函数 (函数) |
