diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sysconf.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sysconf.c | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/sysdeps/unix/sysv/linux/sysconf.c b/sysdeps/unix/sysv/linux/sysconf.c deleted file mode 100644 index db20977cb8..0000000000 --- a/sysdeps/unix/sysv/linux/sysconf.c +++ /dev/null @@ -1,146 +0,0 @@ -/* Get file-specific information about a file. Linux version. - Copyright (C) 2003-2017 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 - <http://www.gnu.org/licenses/>. */ - -#include <errno.h> -#include <fcntl.h> -#include <stdlib.h> -#include <sysdep.h> -#include <time.h> -#include <unistd.h> -#include <sys/resource.h> -#include <sys/param.h> -#include <not-cancel.h> -#include <ldsodefs.h> - -/* Legacy value of ARG_MAX. The macro is now not defined since the - actual value varies based on the stack size. */ -#define legacy_ARG_MAX 131072 - - -static long int posix_sysconf (int name); - - -#ifndef HAS_CPUCLOCK -static long int -has_cpuclock (int name) -{ -# if defined __NR_clock_getres || HP_TIMING_AVAIL - /* If we have HP_TIMING, we will fall back on that if the system - call does not work, so we support it either way. */ -# if !HP_TIMING_AVAIL - /* Check using the clock_getres system call. */ - struct timespec ts; - INTERNAL_SYSCALL_DECL (err); - int r = INTERNAL_SYSCALL (clock_getres, err, 2, - (name == _SC_CPUTIME - ? CLOCK_PROCESS_CPUTIME_ID - : CLOCK_THREAD_CPUTIME_ID), - &ts); - if (INTERNAL_SYSCALL_ERROR_P (r, err)) - return -1; -# endif - return _POSIX_VERSION; -# else - return -1; -# endif -} -# define HAS_CPUCLOCK(name) has_cpuclock (name) -#endif - - -/* Get the value of the system variable NAME. */ -long int -__sysconf (int name) -{ - const char *procfname = NULL; - - switch (name) - { - struct rlimit rlimit; -#ifdef __NR_clock_getres - case _SC_MONOTONIC_CLOCK: - /* Check using the clock_getres system call. */ - { - struct timespec ts; - INTERNAL_SYSCALL_DECL (err); - int r; - r = INTERNAL_SYSCALL (clock_getres, err, 2, CLOCK_MONOTONIC, &ts); - return INTERNAL_SYSCALL_ERROR_P (r, err) ? -1 : _POSIX_VERSION; - } -#endif - - case _SC_CPUTIME: - case _SC_THREAD_CPUTIME: - return HAS_CPUCLOCK (name); - - case _SC_ARG_MAX: - /* Use getrlimit to get the stack limit. */ - if (__getrlimit (RLIMIT_STACK, &rlimit) == 0) - return MAX (legacy_ARG_MAX, rlimit.rlim_cur / 4); - - return legacy_ARG_MAX; - - case _SC_NGROUPS_MAX: - /* Try to read the information from the /proc/sys/kernel/ngroups_max - file. */ - procfname = "/proc/sys/kernel/ngroups_max"; - break; - - case _SC_SIGQUEUE_MAX: - if (__getrlimit (RLIMIT_SIGPENDING, &rlimit) == 0) - return rlimit.rlim_cur; - - /* The /proc/sys/kernel/rtsig-max file contains the answer. */ - procfname = "/proc/sys/kernel/rtsig-max"; - break; - - default: - break; - } - - if (procfname != NULL) - { - int fd = open_not_cancel_2 (procfname, O_RDONLY); - if (fd != -1) - { - /* This is more than enough, the file contains a single integer. */ - char buf[32]; - ssize_t n; - n = TEMP_FAILURE_RETRY (read_not_cancel (fd, buf, sizeof (buf) - 1)); - close_not_cancel_no_status (fd); - - if (n > 0) - { - /* Terminate the string. */ - buf[n] = '\0'; - - char *endp; - long int res = strtol (buf, &endp, 10); - if (endp != buf && (*endp == '\0' || *endp == '\n')) - return res; - } - } - } - - return posix_sysconf (name); -} - -/* Now the POSIX version. */ -#undef __sysconf -#define __sysconf static posix_sysconf -#include <sysdeps/posix/sysconf.c> |