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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include "util.h"
static inline pid_t gettid(void) {
return (pid_t) syscall(SYS_gettid);
}
size_t page_size(void) {
static __thread size_t pgsz = 0;
long r;
if (_likely_(pgsz > 0))
return pgsz;
assert_se((r = sysconf(_SC_PAGESIZE)) > 0);
pgsz = (size_t) r;
return pgsz;
}
bool endswith(const char *s, const char *postfix) {
size_t sl, pl;
assert(s);
assert(postfix);
sl = strlen(s);
pl = strlen(postfix);
if (pl == 0)
return true;
if (sl < pl)
return false;
return memcmp(s + sl - pl, postfix, pl) == 0;
}
int close_nointr(int fd) {
assert(fd >= 0);
for (;;) {
int r;
r = close(fd);
if (r >= 0)
return r;
if (errno != EINTR)
return -errno;
}
}
void close_nointr_nofail(int fd) {
int saved_errno = errno;
/* like close_nointr() but cannot fail, and guarantees errno
* is unchanged */
assert_se(close_nointr(fd) == 0);
errno = saved_errno;
}
int open_terminal(const char *name, int mode) {
int fd, r;
unsigned c = 0;
/*
* If a TTY is in the process of being closed opening it might
* cause EIO. This is horribly awful, but unlikely to be
* changed in the kernel. Hence we work around this problem by
* retrying a couple of times.
*
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
*/
for (;;) {
if ((fd = open(name, mode)) >= 0)
break;
if (errno != EIO)
return -errno;
if (c >= 20)
return -errno;
usleep(50 * USEC_PER_MSEC);
c++;
}
if (fd < 0)
return -errno;
if ((r = isatty(fd)) < 0) {
close_nointr_nofail(fd);
return -errno;
}
if (!r) {
close_nointr_nofail(fd);
return -ENOTTY;
}
return fd;
}
bool streq_ptr(const char *a, const char *b) {
/* Like streq(), but tries to make sense of NULL pointers */
if (a && b)
return streq(a, b);
if (!a && !b)
return true;
return false;
}
bool is_main_thread(void) {
static __thread int cached = 0;
if (_unlikely_(cached == 0))
cached = getpid() == gettid() ? 1 : -1;
return cached > 0;
}
int safe_atou(const char *s, unsigned *ret_u) {
char *x = NULL;
unsigned long l;
assert(s);
assert(ret_u);
errno = 0;
l = strtoul(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
if ((unsigned long) (unsigned) l != l)
return -ERANGE;
*ret_u = (unsigned) l;
return 0;
}
static const char *const log_level_table[] = {
[LOG_EMERG] = "emerg",
[LOG_ALERT] = "alert",
[LOG_CRIT] = "crit",
[LOG_ERR] = "err",
[LOG_WARNING] = "warning",
[LOG_NOTICE] = "notice",
[LOG_INFO] = "info",
[LOG_DEBUG] = "debug"
};
DEFINE_STRING_TABLE_LOOKUP(log_level, int);
char *strnappend(const char *s, const char *suffix, size_t b) {
size_t a;
char *r;
if (!s && !suffix)
return strdup("");
if (!s)
return strndup(suffix, b);
if (!suffix)
return strdup(s);
assert(s);
assert(suffix);
a = strlen(s);
if (b > ((size_t) -1) - a)
return NULL;
r = new(char, a+b+1);
if (!r)
return NULL;
memcpy(r, s, a);
memcpy(r+a, suffix, b);
r[a+b] = 0;
return r;
}
char *strappend(const char *s, const char *suffix) {
return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
}
char *strjoin(const char *x, ...) {
va_list ap;
size_t l;
char *r, *p;
va_start(ap, x);
if (x) {
l = strlen(x);
for (;;) {
const char *t;
size_t n;
t = va_arg(ap, const char *);
if (!t)
break;
n = strlen(t);
if (n > ((size_t) -1) - l) {
va_end(ap);
return NULL;
}
l += n;
}
} else
l = 0;
va_end(ap);
r = new(char, l+1);
if (!r)
return NULL;
if (x) {
p = stpcpy(r, x);
va_start(ap, x);
for (;;) {
const char *t;
t = va_arg(ap, const char *);
if (!t)
break;
p = stpcpy(p, t);
}
va_end(ap);
} else
r[0] = 0;
return r;
}
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