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Fix popen_test in MODE=dbg

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ASAN and vfork() don't appear to play well together. Maybe in later
versions of GCC it'll be better. But vfork() is flirting with danger
after all and that probably doesn't make sense in ASAN mode anyway.
This commit is contained in:
Justine Tunney 2021-05-01 17:13:48 -07:00
parent cef08d47b6
commit fabf7f9f02
5 changed files with 35 additions and 14 deletions
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33
libc/stdio/popen.c
View file

@ -33,7 +33,7 @@
*/
FILE *popen(const char *cmdline, const char *mode) {
FILE *f;
int dir, flags, pipefds[2];
int e, pid, dir, flags, pipefds[2];
flags = fopenflags(mode);
if ((flags & O_ACCMODE) == O_RDONLY) {
dir = 0;
@ -45,13 +45,28 @@ FILE *popen(const char *cmdline, const char *mode) {
}
if (pipe(pipefds) == -1) return NULL;
fcntl(pipefds[dir], F_SETFD, FD_CLOEXEC);
if (!(f = fdopen(pipefds[dir], mode))) abort();
if ((f->pid = vfork()) == -1) abort();
if (!f->pid) {
dup2(pipefds[!dir], !dir);
systemexec(cmdline);
_exit(127);
if ((f = fdopen(pipefds[dir], mode))) {
switch ((pid = vfork())) {
case 0:
dup2(pipefds[!dir], !dir);
systemexec(cmdline);
_exit(127);
default:
f->pid = pid;
close(pipefds[!dir]);
return f;
case -1:
e = errno;
fclose(f);
close(pipefds[!dir]);
errno = e;
return NULL;
}
} else {
e = errno;
close(pipefds[0]);
close(pipefds[1]);
errno = e;
return NULL;
}
close(pipefds[!dir]);
return f;
}