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src/libcommon/getfd.c
93 строки
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Alexey Gladkov
Improve and unify error some messages
02 июн 2020, 14:14
Не верифицирован
02 июн 2020, 14:14
c784dde
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#include "config.h" #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <errno.h> #include <sys/ioctl.h> #include <linux/kd.h> #include "libcommon.h" static const char *conspath[] = { "/proc/self/fd/0", "/dev/tty", "/dev/tty0", "/dev/vc/0", "/dev/systty", "/dev/console", NULL }; /* * getfd.c * * Get an fd for use with kbd/console ioctls. * We try several things because opening /dev/console will fail * if someone else used X (which does a chown on /dev/console). */ static int is_a_console(int fd) { char arg; arg = 0; return (isatty(fd) && ioctl(fd, KDGKBTYPE, &arg) == 0 && ((arg == KB_101) || (arg == KB_84))); } static int open_a_console(const char *fnam) { int fd; /* * For ioctl purposes we only need some fd and permissions * do not matter. But setfont:activatemap() does a write. */ fd = open(fnam, O_RDWR); if (fd < 0) fd = open(fnam, O_WRONLY); if (fd < 0) fd = open(fnam, O_RDONLY); if (fd < 0) return -1; return fd; } int getfd(const char *fnam) { int fd, i; if (fnam) { if ((fd = open_a_console(fnam)) >= 0) { if (is_a_console(fd)) return fd; close(fd); } fprintf(stderr, _("Couldn't open %s"), fnam); fprintf(stderr, "\n"); exit(1); } for (i = 0; conspath[i]; i++) { if ((fd = open_a_console(conspath[i])) >= 0) { if (is_a_console(fd)) return fd; close(fd); } } for (fd = 0; fd < 3; fd++) if (is_a_console(fd)) return fd; fprintf(stderr, _("Couldn't get a file descriptor referring to the console.")); fprintf(stderr, "\n"); /* total failure */ exit(1); }