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#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "stdio_impl.h"
void perror(const char *msg)
{
FILE *f = stderr;
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);
fputc(':', f);
fputc(' ', f);
}
fwrite(errstr, strlen(errstr), 1, f);
fputc('\n', f);
f->mode = old_mode;
f->locale = old_locale;
FUNLOCK(f);
}
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