mirror of
https://github.com/fish-shell/fish-shell
synced 2024-12-27 05:13:10 +00:00
504 lines
7.2 KiB
C
504 lines
7.2 KiB
C
/** \file signal.c
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The library for various signal related issues
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <errno.h>
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#include "common.h"
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#include "util.h"
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#include "wutil.h"
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#include "signal.h"
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#include "event.h"
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#include "reader.h"
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#include "proc.h"
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/**
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Struct describing an entry for the lookup table used to convert
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between signal names and signal ids, etc.
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*/
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struct lookup_entry
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{
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/**
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Signal id
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*/
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int signal;
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/**
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Signal name
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*/
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const wchar_t *name;
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/**
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Signal description
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*/
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const wchar_t *desc;
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};
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/**
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Lookup table used to convert between signal names and signal ids,
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etc.
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*/
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static struct lookup_entry lookup[] =
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{
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{
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SIGHUP,
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L"SIGHUP",
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L"Terminal hung up"
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}
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,
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{
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SIGINT,
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L"SIGINT",
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L"Quit request from job control (^C)"
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}
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,
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{
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SIGQUIT,
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L"SIGQUIT",
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L"Quit request from job control with core dump (^\\)"
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}
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,
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{
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SIGILL,
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L"SIGILL",
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L"Illegal instruction"
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}
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,
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{
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SIGTRAP,
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L"SIGTRAP",
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L"Trace or breakpoint trap"
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}
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,
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{
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SIGABRT,
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L"SIGABRT",
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L"Abort"
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}
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,
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{
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SIGBUS,
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L"SIGBUS",
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L"Misaligned address error"
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}
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,
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{
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SIGFPE,
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L"SIGFPE",
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L"Floating point exception"
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}
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,
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{
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SIGKILL,
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L"SIGKILL",
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L"Forced quit"
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}
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,
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{
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SIGUSR1,
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L"SIGUSR1",
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L"User defined signal 1"
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}
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,
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{
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SIGUSR2, L"SIGUSR2",
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L"User defined signal 2"
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}
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,
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{
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SIGSEGV,
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L"SIGSEGV",
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L"Address boundary error"
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}
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,
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{
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SIGPIPE,
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L"SIGPIPE",
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L"Broken pipe"
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}
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,
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{
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SIGALRM,
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L"SIGALRM",
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L"Timer expired"
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}
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,
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{
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SIGTERM,
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L"SIGTERM",
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L"Polite quit request"
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}
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,
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{
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SIGCHLD,
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L"SIGCHLD",
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L"Child process status changed"
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}
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,
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{
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SIGCONT,
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L"SIGCONT",
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L"Continue previously stopped process"
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}
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,
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{
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SIGSTOP,
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L"SIGSTOP",
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L"Forced stop"
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}
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,
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{
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SIGTSTP,
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L"SIGTSTP",
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L"Stop request from job control (^Z)"
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}
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,
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{
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SIGTTIN,
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L"SIGTTIN",
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L"Stop from terminal input"
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}
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,
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{
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SIGTTOU,
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L"SIGTTOU",
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L"Stop from terminal output"
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}
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,
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{
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SIGURG,
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L"SIGURG",
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L"Urgent socket condition"
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}
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,
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{
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SIGXCPU,
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L"SIGXCPU",
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L"CPU time limit exceeded"
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}
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,
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{
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SIGXFSZ,
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L"SIGXFSZ",
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L"File size limit exceeded"
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}
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,
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{
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SIGVTALRM,
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L"SIGVTALRM",
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L"Virtual timer expired"
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}
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,
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{
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SIGPROF,
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L"SIGPROF",
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L"Profiling timer expired"
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}
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,
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{
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SIGWINCH,
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L"SIGWINCH",
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L"Window size change"
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}
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,
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{
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SIGIO,
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L"SIGIO",
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L"Asynchronous IO event"
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}
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,
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#ifdef SIGPWR
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{
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SIGPWR,
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L"SIGPWR",
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L"Power failure"
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}
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,
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#endif
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{
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SIGSYS,
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L"SIGSYS",
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L"Bad system call"
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}
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,
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{
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0,
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0,
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0
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}
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}
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;
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/**
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Test if \c name is a string describing the signal named \c canonical.
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*/
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static int match_signal_name( const wchar_t *canonical,
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const wchar_t *name )
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{
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if( wcsncasecmp( name, L"sig", 3 )==0)
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name +=3;
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return wcscasecmp( canonical+3,name ) == 0;
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}
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int wcs2sig( const wchar_t *str )
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{
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int i, res;
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wchar_t *end=0;
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for( i=0; lookup[i].desc ; i++ )
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{
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if( match_signal_name( lookup[i].name, str) )
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{
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return lookup[i].signal;
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}
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}
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errno=0;
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res = wcstol( str, &end, 10 );
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if( !errno && end && !*end )
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return res;
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return -1;
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}
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const wchar_t *sig2wcs( int sig )
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{
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int i;
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for( i=0; lookup[i].desc ; i++ )
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{
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if( lookup[i].signal == sig )
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{
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return lookup[i].name;
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}
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}
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return L"Unknown";
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}
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const wchar_t *sig_description( int sig )
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{
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int i;
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for( i=0; lookup[i].desc ; i++ )
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{
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if( lookup[i].signal == sig )
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{
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return lookup[i].desc;
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}
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}
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return L"Unknown";
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}
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static void default_handler(int signal, siginfo_t *info, void *context)
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{
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event_t e;
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e.type=EVENT_SIGNAL;
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e.param1.signal = signal;
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e.function_name=0;
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event_fire( &e, 0 );
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}
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/**
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Respond to a winch signal by checking the terminal size
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*/
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static void handle_winch( int sig, siginfo_t *info, void *context )
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{
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common_handle_winch( sig );
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default_handler( sig, 0, 0 );
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}
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/**
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Interactive mode ^C handler. Respond to int signal by setting
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interrupted-flag and stopping all loops and conditionals.
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*/
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static void handle_int( int sig, siginfo_t *info, void *context )
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{
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reader_handle_int( sig );
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default_handler( sig, info, context);
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}
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/**
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sigchld handler. Does notification and calls the handler in proc.c
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*/
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static void handle_chld( int sig, siginfo_t *info, void *context )
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{
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job_handle_signal( sig, info, context );
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default_handler( sig, info, context);
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}
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void signal_reset_handlers()
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{
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int i;
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struct sigaction act;
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sigemptyset( & act.sa_mask );
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act.sa_flags=0;
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act.sa_handler=SIG_DFL;
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for( i=0; lookup[i].desc ; i++ )
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{
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sigaction( lookup[i].signal, &act, 0);
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}
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}
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/**
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Sets appropriate signal handlers.
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*/
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void signal_set_handlers()
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{
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struct sigaction act;
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sigemptyset( & act.sa_mask );
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act.sa_flags=SA_SIGINFO;
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act.sa_sigaction = &default_handler;
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/*
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First reset everything to a use default_handler, a function
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whose sole action is to fire of an event
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*/
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sigaction( SIGINT, &act, 0);
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sigaction( SIGQUIT, &act, 0);
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sigaction( SIGTSTP, &act, 0);
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sigaction( SIGTTIN, &act, 0);
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sigaction( SIGTTOU, &act, 0);
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sigaction( SIGCHLD, &act, 0);
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/*
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Ignore sigpipe, it is generated if fishd dies, but we can
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recover.
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*/
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sigaction( SIGPIPE, &act, 0);
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if( is_interactive )
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{
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/*
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Interactive mode. Ignore interactive signals. We are a
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shell, we know whats best for the user. ;-)
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*/
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act.sa_handler=SIG_IGN;
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sigaction( SIGINT, &act, 0);
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sigaction( SIGQUIT, &act, 0);
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sigaction( SIGTSTP, &act, 0);
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sigaction( SIGTTIN, &act, 0);
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sigaction( SIGTTOU, &act, 0);
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act.sa_sigaction = &handle_int;
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act.sa_flags = SA_SIGINFO;
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if( sigaction( SIGINT, &act, 0) )
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{
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wperror( L"sigaction" );
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exit(1);
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}
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act.sa_sigaction = &handle_chld;
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act.sa_flags = SA_SIGINFO;
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if( sigaction( SIGCHLD, &act, 0) )
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{
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wperror( L"sigaction" );
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exit(1);
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}
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act.sa_flags = SA_SIGINFO;
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act.sa_sigaction= &handle_winch;
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if( sigaction( SIGWINCH, &act, 0 ) )
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{
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wperror( L"sigaction" );
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exit(1);
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}
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}
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else
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{
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/*
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Non-interactive. Ignore interrupt, check exit status of
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processes to determine result instead.
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*/
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act.sa_handler=SIG_IGN;
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sigaction( SIGINT, &act, 0);
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sigaction( SIGQUIT, &act, 0);
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act.sa_handler=SIG_DFL;
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act.sa_sigaction = &handle_chld;
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act.sa_flags = SA_SIGINFO;
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if( sigaction( SIGCHLD, &act, 0) )
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{
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wperror( L"sigaction" );
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exit(1);
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}
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}
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}
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void signal_handle( int sig, int do_handle )
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{
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struct sigaction act;
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/*
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These should always be handled
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*/
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if( (sig == SIGINT) ||
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(sig == SIGQUIT) ||
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(sig == SIGTSTP) ||
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(sig == SIGTTIN) ||
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(sig == SIGTTOU) ||
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(sig == SIGCHLD) )
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return;
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sigemptyset( & act.sa_mask );
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if( do_handle )
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{
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act.sa_flags=SA_SIGINFO;
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act.sa_sigaction = &default_handler;
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}
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else
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{
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act.sa_flags=0;
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act.sa_handler = SIG_DFL;
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}
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sigaction( sig, &act, 0);
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}
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void signal_block()
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{
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int i;
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sigset_t chldset;
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sigemptyset( &chldset );
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for( i=0; lookup[i].desc ; i++ )
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{
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sigaddset( &chldset, lookup[i].signal );
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}
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sigprocmask(SIG_BLOCK, &chldset, 0);
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}
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void signal_unblock()
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{
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int i;
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sigset_t chldset;
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sigemptyset( &chldset );
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for( i=0; lookup[i].desc ; i++ )
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{
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sigaddset( &chldset, lookup[i].signal );
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}
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sigprocmask(SIG_UNBLOCK, &chldset, 0);
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}
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