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Work towards improving signals and processes

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This commit is contained in:
Justine Tunney 2021-01-27 19:34:02 -08:00
parent de703b182c
commit d7ac16a9ed
96 changed files with 1474 additions and 427 deletions
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51
libc/stdio/system.c
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@ -18,12 +18,15 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/sigbits.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/paths.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/sig.h"
/**
* Launches program with system command interpreter.
@ -34,26 +37,36 @@
*/
int system(const char *cmdline) {
int pid, wstatus;
char comspec[128];
const char *prog, *arg;
if (weaken(fflush)) weaken(fflush)(NULL);
if (cmdline) {
if ((pid = vfork()) == -1) return -1;
if (!pid) {
strcpy(comspec, kNtSystemDirectory);
strcat(comspec, "cmd.exe");
prog = !IsWindows() ? _PATH_BSHELL : comspec;
arg = !IsWindows() ? "-c" : "/C";
execv(prog, (char *const[]){prog, arg, cmdline, NULL});
_exit(errno);
} else if (wait4(pid, &wstatus, 0, NULL) != -1) {
return wstatus;
} else {
return -1;
sigset_t chldmask, savemask;
struct sigaction ignore, saveint, savequit;
if (!cmdline) return 1;
ignore.sa_flags = 0;
ignore.sa_handler = SIG_IGN;
sigemptyset(&ignore.sa_mask);
sigaction(SIGINT, &ignore, &saveint);
sigaction(SIGQUIT, &ignore, &savequit);
sigemptyset(&chldmask);
sigaddset(&chldmask, SIGCHLD);
sigprocmask(SIG_BLOCK, &chldmask, &savemask);
pid = fork();
if (!pid) {
sigaction(SIGINT, &saveint, NULL);
sigaction(SIGQUIT, &savequit, NULL);
sigprocmask(SIG_SETMASK, &savemask, NULL);
systemexec(cmdline);
_exit(127);
} else if (pid != -1) {
while (wait4(pid, &wstatus, 0, NULL) == -1) {
if (errno != EINTR) {
wstatus = -1;
break;
}
}
} else if (IsWindows()) {
return true;
} else {
return fileexists(_PATH_BSHELL);
wstatus = -1;
}
sigaction(SIGINT, &saveint, NULL);
sigaction(SIGQUIT, &savequit, NULL);
sigprocmask(SIG_SETMASK, &savemask, NULL);
return wstatus;
}