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Code Issues 1 Releases Wiki Activity

Avoid setting O_CLOEXEC on stdin/stdout/stderr.

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This commit is contained in:
Andrew Chambers 2020-05-09 22:26:50 +12:00
parent 95660002e1
commit 057486cf56
1 changed files with 3 additions and 14 deletions
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17
src/core/io.c
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@ -92,7 +92,8 @@ static Janet makef(FILE *f, int flags) {
#ifndef JANET_WINDOWS #ifndef JANET_WINDOWS
/* While we would like fopen to set cloexec by default (like O_CLOEXEC) with the e flag, that is /* While we would like fopen to set cloexec by default (like O_CLOEXEC) with the e flag, that is
* not standard. */ * not standard. */
fcntl(fileno(f), F_SETFD, FD_CLOEXEC); if (!(flags & JANET_FILE_NOT_CLOSEABLE))
fcntl(fileno(f), F_SETFD, FD_CLOEXEC);
#endif #endif
return janet_wrap_abstract(iof); return janet_wrap_abstract(iof);
} }
@ -136,22 +137,10 @@ static Janet cfun_io_popen(int32_t argc, Janet *argv) {
static Janet cfun_io_temp(int32_t argc, Janet *argv) { static Janet cfun_io_temp(int32_t argc, Janet *argv) {
(void)argv; (void)argv;
janet_fixarity(argc, 0); janet_fixarity(argc, 0);
// XXX use mkostemp when we can to avoid CLOEXEC race.
FILE *tmp = tmpfile(); FILE *tmp = tmpfile();
if (!tmp) if (!tmp)
janet_panicf("unable to create temporary file - %s", strerror(errno)); 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.
For threaded programs we should 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");
}
#endif
return janet_makefile(tmp, JANET_FILE_WRITE | JANET_FILE_READ | JANET_FILE_BINARY); return janet_makefile(tmp, JANET_FILE_WRITE | JANET_FILE_READ | JANET_FILE_BINARY);
} }