mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/* Utilities functions to read/parse Linux procfs and sysfs.
|
|
Copyright (C) 2023-2025 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library 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.
|
|
|
|
The GNU C Library 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 the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <assert.h>
|
|
#include <not-cancel.h>
|
|
#include <procutils.h>
|
|
#include <string.h>
|
|
|
|
static int
|
|
next_line (char **r, int fd, char *const buffer, char **cp, char **re,
|
|
char *const buffer_end)
|
|
{
|
|
char *res = *cp;
|
|
char *nl = memchr (*cp, '\n', *re - *cp);
|
|
if (nl == NULL)
|
|
{
|
|
if (*cp != buffer)
|
|
{
|
|
if (*re == buffer_end)
|
|
{
|
|
memmove (buffer, *cp, *re - *cp);
|
|
*re = buffer + (*re - *cp);
|
|
*cp = buffer;
|
|
|
|
ssize_t n = TEMP_FAILURE_RETRY (
|
|
__read_nocancel (fd, *re, buffer_end - *re));
|
|
if (n < 0)
|
|
return -1;
|
|
|
|
*re += n;
|
|
|
|
nl = memchr (*cp, '\n', *re - *cp);
|
|
if (nl == NULL)
|
|
/* Line too long. */
|
|
return 0;
|
|
}
|
|
else
|
|
nl = memchr (*cp, '\n', *re - *cp);
|
|
|
|
res = *cp;
|
|
}
|
|
|
|
if (nl == NULL)
|
|
nl = *re - 1;
|
|
}
|
|
|
|
*nl = '\0';
|
|
*cp = nl + 1;
|
|
assert (*cp <= *re);
|
|
|
|
if (res == *re)
|
|
return 0;
|
|
|
|
*r = res;
|
|
return 1;
|
|
}
|
|
|
|
bool
|
|
__libc_procutils_read_file (const char *filename,
|
|
procutils_closure_t closure,
|
|
void *arg)
|
|
{
|
|
enum { buffer_size = PROCUTILS_MAX_LINE_LEN };
|
|
char buffer[buffer_size];
|
|
char *buffer_end = buffer + buffer_size;
|
|
char *cp = buffer_end;
|
|
char *re = buffer_end;
|
|
|
|
int fd = TEMP_FAILURE_RETRY (
|
|
__open64_nocancel (filename, O_RDONLY | O_CLOEXEC));
|
|
if (fd == -1)
|
|
return false;
|
|
|
|
char *l;
|
|
int r;
|
|
while ((r = next_line (&l, fd, buffer, &cp, &re, buffer_end)) > 0)
|
|
if (closure (l, arg) != 0)
|
|
break;
|
|
|
|
__close_nocancel_nostatus (fd);
|
|
|
|
return r == 1;
|
|
}
|