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#include <signal.h>
#include <errno.h>
#include "syscall.h"
int raise(int sig)
{
int pid, tid, ret;
/* Getting the pid/tid pair is not atomic, and could give wrong
* result if a fork occurs in a signal handler between the two
* syscalls. Use the tgkill syscall's ESRCH semantics to detect
* this condition and retry. */
do {
tid = syscall0(__NR_gettid);
pid = syscall0(__NR_getpid);
ret = syscall3(__NR_tgkill, pid, tid, sig);
} while (ret<0 && errno == ESRCH);
return ret;
}
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