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prevent perror from clobbering stderr's orientation

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this requirement is specified by POSIX.
This commit is contained in:
Rich Felker 2018-08-30 00:08:16 -04:00
parent cd8d830997
commit cff4b910ab
1 changed files with 8 additions and 0 deletions
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8
src/stdio/perror.c
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@ -9,6 +9,11 @@ void perror(const char *msg)
char *errstr = strerror(errno);
FLOCK(f);
/* Save stderr's orientation and encoding rule, since perror is not
* permitted to change them. */
void *old_locale = f->locale;
int old_mode = f->mode;
if (msg && *msg) {
fwrite(msg, strlen(msg), 1, f);
@ -18,5 +23,8 @@ void perror(const char *msg)
fwrite(errstr, strlen(errstr), 1, f);
fputc('\n', f);
f->mode = old_mode;
f->locale = old_locale;
FUNLOCK(f);
}