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Change sigaction_f to match sysv signature (#585)

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Gavin Hayes 2022-09-02 08:08:35 -04:00 • committed by GitHub
parent 33b5b5b312
commit 263711965f
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23 changed files with 46 additions and 35 deletions
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14
libc/calls/sigaction.c
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@ -251,7 +251,7 @@ static int __sigaction(int sig, const struct sigaction *act,
/**
* Installs handler for kernel interrupt to thread, e.g.:
*
* void GotCtrlC(int sig, siginfo_t *si, ucontext_t *ctx);
* void GotCtrlC(int sig, siginfo_t *si, void *ctx);
* struct sigaction sa = {.sa_sigaction = GotCtrlC,
* .sa_flags = SA_RESETHAND|SA_RESTART|SA_SIGINFO};
* CHECK_NE(-1, sigaction(SIGINT, &sa, NULL));
@ -259,10 +259,11 @@ static int __sigaction(int sig, const struct sigaction *act,
* The following flags are supported across platforms:
*
* - `SA_SIGINFO`: Causes the `siginfo_t` and `ucontext_t` parameters to
* be passed. This not only gives you more information about the
* signal, but also allows your signal handler to change the CPU
* registers. That's useful for recovering from crashes. If you don't
* use this attribute, then signal delivery will go a little faster.
* be passed. `void *ctx` actually refers to `struct ucontext *`.
* This not only gives you more information about the signal, but also
* allows your signal handler to change the CPU registers. That's
* useful for recovering from crashes. If you don't use this attribute,
* then signal delivery will go a little faster.
*
* - `SA_RESTART`: Enables BSD signal handling semantics. Normally i/o
* entrypoints check for pending signals to deliver. If one gets
@ -371,7 +372,8 @@ static int __sigaction(int sig, const struct sigaction *act,
* ctx->uc_mcontext.rip += xedd.length;
* }
*
* void OnCrash(int sig, struct siginfo *si, struct ucontext *ctx) {
* void OnCrash(int sig, struct siginfo *si, void *vctx) {
* struct ucontext *ctx = vctx;
* SkipOverFaultingInstruction(ctx);
* ContinueOnCrash(); // reinstall here in case *rip faults
* }