| SIGHUP | 1 | Hangup (POSIX) | 终止进程 终端线路挂断 |
| SIGINT | 2 | Terminal interrupt (ANSI) | 终止进程 中断进程 Ctrl+C |
| SIGQUIT | 3 | Terminal quit (POSIX) | 建立CORE文件终止进程，并且生成core文件 Ctrl+| |
| SIGILL | 4 | Illegal instruction (ANSI) | 建立CORE文件,非法指令 |
| SIGTRAP | 5 | Trace trap (POSIX) | 建立CORE文件,跟踪自陷 |
| SIGIOT | 6 | IOT Trap (4.2 BSD) | 建立CORE文件,执行I/O自陷 |
| SIGBUS | 7 | BUS error (4.2 BSD) | 建立CORE文件,总线错误 |
| SIGFPE | 8 | Floating point exception (ANSI) | 建立CORE文件,浮点异常 |
| SIGKILL | 9 | Kill(can’t be caught or ignored) (POSIX) | 终止进程 杀死进程 |
| SIGUSR1 | 10 | User defined signal 1 (POSIX) | 终止进程 用户定义信号1 |
| SIGSEGV | 11 | Invalid memory segment access (ANSI) | 建立CORE文件,段非法错误 |
| SIGUSR2 | 12 | User defined signal 2 (POSIX) | 终止进程 用户定义信号2 |
| SIGPIPE | 13 | Write on a pipe with no reader, Broken pipe | (POSIX) |
| SIGALRM | 14 | Alarm clock (POSIX) | 终止进程 计时器到时 |
| SIGTERM | 15 | Termination (ANSI) | 终止进程 软件终止信号 |
| SIGSTKFLT | 16 | Stack fault | |
| SIGCLD | SIGCHLD | Same as SIGCHLD (System V) | |
| SIGCHLD | 17 | Child process has stopped or exited, changed | (POSIX) |
| | | |
| SIGCONT | 18 | Continue executing, if stopped (POSIX) | 忽略信号 继续执行一个停止的进程 |
| SIGSTOP | 19 | Stop executing(can’t be caught or ignored) | (POSIX) |
| SIGTSTP | 20 | Terminal stop signal (POSIX) | 停止进程 终端来的停止信号 Ctrl+Z |
| SIGTTIN | 21 | Background process trying to read, from TTY | (POSIX) |
| SIGTTOU | 22 | Background process trying to write, to TTY | (POSIX) |
| SIGURG | 23 | Urgent condition on socket (4.2 BSD) | 忽略信号 I/O紧急信号 |
| SIGXCPU | 24 | CPU limit exceeded (4.2 BSD) | 终止进程 CPU时限超时 |
| SIGXFSZ | 25 | File size limit exceeded (4.2 BSD) | 终止进程 文件长度过长 |
| SIGVTALRM | 26 | Virtual alarm clock (4.2 BSD) | 终止进程 虚拟计时器到时 |
| SIGPROF | 27 | Profiling alarm clock (4.2 BSD) | 终止进程 统计分布图用计时器到时 |
| SIGWINCH | 28 | Window size change (4.3 BSD, Sun) | 忽略信号 窗口大小发生变化 |
| SIGPOLL | SIGIO | Pollable event occurred (System V) | |
| SIGIO | 29 | I/O now possible (4.2 BSD) | 忽略信号 描述符上可以进行I/O |
| SIGPWR | 30 | Power failure restart (System V) | |
| SIGSYS | 31 | /* Bad system call. */ | |
| SIGUNUSED | 31 | | |
| … | | | |
