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b3b70d749f
comment when I unblock it in pty.c to reflect reality. Also I've moved block_signal() out of pterm.c into signal.c, so I can conveniently use it for unblocking SIGCHLD rather than having to reinvent it in pty.c. [originally from svn r5006]
46 lines
1.0 KiB
C
46 lines
1.0 KiB
C
#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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/*
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* Calling signal() is a non-portable, as it varies in meaning between
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* platforms and depending on feature macros, and has stupid semantics
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* at least some of the time.
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*
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* This function provides the same interface as the libc function, but
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* provides consistent semantics. It assumes POSIX semantics for
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* sigaction() (so you might need to do some more work if you port to
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* something ancient like SunOS 4)
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*/
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void (*putty_signal(int sig, void (*func)(int)))(int) {
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struct sigaction sa;
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struct sigaction old;
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sa.sa_handler = func;
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if(sigemptyset(&sa.sa_mask) < 0)
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return SIG_ERR;
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sa.sa_flags = SA_RESTART;
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if(sigaction(sig, &sa, &old) < 0)
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return SIG_ERR;
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return old.sa_handler;
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}
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void block_signal(int sig, int block_it)
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{
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sigset_t ss;
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sigemptyset(&ss);
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sigaddset(&ss, sig);
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if(sigprocmask(block_it ? SIG_BLOCK : SIG_UNBLOCK, &ss, 0) < 0) {
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perror("sigprocmask");
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exit(1);
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}
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}
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/*
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Local Variables:
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c-basic-offset:4
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comment-column:40
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End:
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*/
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