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/*
* setproctitle.c -- mimic setproctitle
*
* Copyright (c) 2020, NLnet Labs. All rights reserved.
*
* See LICENSE for the license.
*
*/
#include "config.h"
#if defined(__linux)
#include <assert.h>
#include <errno.h>
#ifndef HAVE_CONFIG_H
#include <libgen.h>
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <unistd.h>
static char *executable(void)
{
char *ptr, *buf = NULL;
size_t len = 0;
ssize_t cnt = 0;
buf = NULL;
do {
len += 32;
ptr = realloc(buf, len);
if (ptr == NULL) {
if (buf != NULL) {
free(buf);
}
return NULL;
}
buf = ptr;
cnt = readlink("/proc/self/exe", buf, len);
} while (cnt >= 0 && (size_t)cnt == len);
if (cnt >= 0) {
buf[cnt] = '\0';
return buf;
}
free(buf);
return NULL;
}
void setproctitle(const char *fmt, ...)
{
va_list ap;
char buf[32];
int cnt = 0, off = 0;
/* prepend executable name if fmt does not start with '-' */
if (fmt == NULL || fmt[0] != '-' || fmt[(off = 1)] == '\0') {
char *exe;
const char *sep = (fmt && fmt[off] != '\0') ? ": " : "";
if ((exe = executable()) != NULL) {
cnt = snprintf(buf, sizeof(buf), "%s%s", basename(exe), sep);
if ((size_t)cnt >= sizeof(buf)) {
cnt = 31; /* leave room for '\0' */
}
free(exe);
}
}
if (fmt != NULL && fmt[off] != '\0') {
va_start(ap, fmt);
cnt = vsnprintf(
buf+(size_t)cnt, sizeof(buf)-(size_t)cnt, fmt+(size_t)off, ap);
va_end(ap);
}
if (cnt > 0) {
assert(cnt > 0 && (size_t)cnt < sizeof(buf));
(void)prctl(PR_SET_NAME, buf, 0, 0, 0);
}
}
#endif /* __linux */
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