Program received signal SIGPIPE, Broken pipe

2013年5月21日 | 由 helight | 800字 | 阅读大约需要2分钟 | 归档于 linux 应用 | 标签 #uwsgi

在gdb调试程序的时候发现一个错误信息, Program received signal SIGPIPE, Broken pipe,原来是客户端程序在给服务器进行写入操作的时候,如果服务器执行了close操作,这时候根据tcp协议规定服务器要给客户端返回一个RST响应,如果client再用之前的fd往这个服务器写数据的时候,系统救护发一个SIGPIPE信号给进程,告诉进程链接已经断开。但是SIGPIPE信号的默认执行动作是terminate,所以客户端会退出,如果要想客户端不响应这个信号,则直接将其屏蔽忽略即可。

把SIGPIPE设为SIG_IGN

signal(SIGPIPE,SIG_IGN);

这里顺便再复习以下linux信号函数的一些知识吧。看看man手册,东西还不少,先摘取一些

#include <signal.h>


typedef void (*sighandler_t)(int);

sighandler_t signal(int signum, sighandler_t handler);

修改信号的处理函数,系统中定义的信号处理有默认处理函数和忽略处理,默认处理类型可以分为下面几种:

Term   Default action is to terminate the process.

       Ign    Default action is to ignore the signal.

       Core   Default action is to terminate the process and dump core (see

       Stop   Default action is to stop the process.

       Cont   Default action is to continue the process if it is currently
              stopped.

linux支持的信号有以下 POSIX.1-1990 标准种的信号有

Signal     Value     Action   Comment
       ----------------------------------------------------------------------
       SIGHUP        1       Term    Hangup detected on controlling terminal
                                     or death of controlling process
       SIGINT        2       Term    Interrupt from keyboard
       SIGQUIT       3       Core    Quit from keyboard
       SIGILL        4       Core    Illegal Instruction
       SIGABRT       6       Core    Abort signal from abort(3)
       SIGFPE        8       Core    Floating point exception
       SIGKILL       9       Term    Kill signal
       SIGSEGV      11       Core    Invalid memory reference
       SIGPIPE      13       Term    Broken pipe: write to pipe with no
                                     readers
       SIGALRM      14       Term    Timer signal from alarm(2)
       SIGTERM      15       Term    Termination signal
       SIGUSR1   30,10,16    Term    User-defined signal 1
       SIGUSR2   31,12,17    Term    User-defined signal 2
       SIGCHLD   20,17,18    Ign     Child stopped or terminated
       SIGCONT   19,18,25    Cont    Continue if stopped
       SIGSTOP   17,19,23    Stop    Stop process
       SIGTSTP   18,20,24    Stop    Stop typed at terminal
       SIGTTIN   21,21,26    Stop    Terminal input for background process
       SIGTTOU   22,22,27    Stop    Terminal output for background process

其中SIGKILL和SIGSTOP这两个信号是不可以被捕捉,忽略,阻塞的。 SUSv2 and POSIX.1-2001中增加的。

 Signal       Value     Action   Comment
       --------------------------------------------------------------------
       SIGBUS      10,7,10     Core    Bus error (bad memory access)
       SIGPOLL                 Term    Pollable event (Sys V).
                                       Synonym for SIGIO
       SIGPROF     27,27,29    Term    Profiling timer expired
       SIGSYS      12,31,12    Core    Bad argument to routine (SVr4)
       SIGTRAP        5        Core    Trace/breakpoint trap
       SIGURG      16,23,21    Ign     Urgent condition on socket (4.2BSD)
       SIGVTALRM   26,26,28    Term    Virtual alarm clock (4.2BSD)
       SIGXCPU     24,24,30    Core    CPU time limit exceeded (4.2BSD)
       SIGXFSZ     25,25,31    Core    File size limit exceeded (4.2BSD)
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