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libc: Implement signal()

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This commit is contained in:
apio 2023-07-10 21:17:25 +02:00
parent fe9827bbeb
commit 4a5947e10e
Signed by: apio
GPG Key ID: B8A7D06E42258954
2 changed files with 17 additions and 0 deletions
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5
libc/include/signal.h
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@ -8,6 +8,8 @@
typedef int sig_atomic_t; typedef int sig_atomic_t;
#define SIG_ERR (__simple_sighandler_t)(-3)
#ifdef __cplusplus #ifdef __cplusplus
extern "C" extern "C"
{ {
@ -19,6 +21,9 @@ extern "C"
int sigaction(int signo, const struct sigaction* act, struct sigaction* oldact); int sigaction(int signo, const struct sigaction* act, struct sigaction* oldact);
#pragma GCC pop_options #pragma GCC pop_options
/* Change the current thread's signal disposition for a specific signal. */
__simple_sighandler_t signal(int signo, __simple_sighandler_t handler);
/* Send a signal to a specific process. */ /* Send a signal to a specific process. */
int kill(pid_t pid, int signo); int kill(pid_t pid, int signo);

12
libc/src/signal.cpp
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@ -13,6 +13,18 @@ extern "C"
__errno_return(rc, int); __errno_return(rc, int);
} }
__simple_sighandler_t signal(int signo, __simple_sighandler_t handler)
{
struct sigaction act, oldact;
act.sa_handler = handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
if (sigaction(signo, &act, &oldact) < 0) return SIG_ERR;
return oldact.sa_handler;
}
int kill(pid_t pid, int signo) int kill(pid_t pid, int signo)
{ {
long rc = syscall(SYS_kill, pid, signo); long rc = syscall(SYS_kill, pid, signo);