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Set the CLOEXEC flag on file/temp files.

This commit is contained in:
Andrew Chambers 2020-05-06 11:14:42 +12:00
parent 688fe6db5e
commit 06c28f3a4d
1 changed files with 16 additions and 0 deletions
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16
src/core/io.c
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@ -30,6 +30,7 @@
#include <errno.h>
#ifndef JANET_WINDOWS
#include <fcntl.h>
#include <sys/wait.h>
#endif
@ -132,6 +133,21 @@ static Janet cfun_io_temp(int32_t argc, Janet *argv) {
FILE *tmp = tmpfile();
if (!tmp)
janet_panicf("unable to create temporary file - %s", strerror(errno));
#ifndef JANET_WINDOWS
/* It seems highly unlikely a typical janet user wants a tempfile to be inherited and
libc tmpfile does NOT set O_CLOEXEC by default,
Even though setting this flag after a delay is racy in threaded programs,
It helps in single threaded ones. The fix for threaded programs would be to use mkostemp
which is coming to POSIX at a later time. */
if (fcntl(fileno(tmp), F_SETFD, FD_CLOEXEC) != 0) {
fclose(tmp);
janet_panic("unable initialize temporary file");
}
/* Do anything for windows? */
#endif
return janet_makefile(tmp, JANET_FILE_WRITE | JANET_FILE_READ | JANET_FILE_BINARY);
}