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c81b35c08b
Here we replace the various fgets() with a mmap() call for the config file reading, due to the reported performance problems with klibc. Thanks to Patrick's testing, it makes a very small, close to nothing speed gain for libc users, but a 6 times speed increase for klibc users with a 1000 line config file. I've created a udev_lib.[hc] for this and also moved all the generic stuff from udev.h in there and uninlined the functions.
112 lines
2.1 KiB
C
112 lines
2.1 KiB
C
/*
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* udev_lib - generic stuff used by udev
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*
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* Copyright (C) 2004 Kay Sievers <kay@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include "libsysfs/sysfs/libsysfs.h"
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#include "udev.h"
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#include "udev_lib.h"
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char *get_action(void)
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{
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char *action;
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action = getenv("ACTION");
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if (action != NULL && strlen(action) > ACTION_SIZE)
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action[ACTION_SIZE-1] = '\0';
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return action;
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}
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char *get_devpath(void)
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{
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char *devpath;
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devpath = getenv("DEVPATH");
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if (devpath != NULL && strlen(devpath) > DEVPATH_SIZE)
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devpath[DEVPATH_SIZE-1] = '\0';
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return devpath;
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}
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char *get_seqnum(void)
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{
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char *seqnum;
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seqnum = getenv("SEQNUM");
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return seqnum;
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}
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char *get_subsystem(char *subsystem)
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{
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if (subsystem != NULL && strlen(subsystem) > SUBSYSTEM_SIZE)
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subsystem[SUBSYSTEM_SIZE-1] = '\0';
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return subsystem;
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}
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int file_map(const char *filename, char **buf, size_t *bufsize)
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{
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struct stat stats;
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int fd;
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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return -1;
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}
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if (fstat(fd, &stats) < 0) {
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return -1;
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}
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*buf = mmap(NULL, stats.st_size, PROT_READ, MAP_SHARED, fd, 0);
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if (*buf == MAP_FAILED) {
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return -1;
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}
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*bufsize = stats.st_size;
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close(fd);
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return 0;
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}
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void file_unmap(char *buf, size_t bufsize)
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{
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munmap(buf, bufsize);
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}
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size_t buf_get_line(char *buf, size_t buflen, size_t cur)
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{
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size_t count = 0;
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for (count = cur; count < buflen && buf[count] != '\n'; count++);
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return count - cur;
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}
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