#include #include #include #include #include #include #include #include #include #include static int set_immutable(const char *path, int immutable) { unsigned int flags; int fd; int rc; int error; fd = open(path, O_RDONLY); if (fd < 0) return fd; rc = ioctl(fd, FS_IOC_GETFLAGS, &flags); if (rc < 0) { error = errno; close(fd); errno = error; return rc; } if (immutable) flags |= FS_IMMUTABLE_FL; else flags &= ~FS_IMMUTABLE_FL; rc = ioctl(fd, FS_IOC_SETFLAGS, &flags); error = errno; close(fd); errno = error; return rc; } static int get_immutable(const char *path) { unsigned int flags; int fd; int rc; int error; fd = open(path, O_RDONLY); if (fd < 0) return fd; rc = ioctl(fd, FS_IOC_GETFLAGS, &flags); if (rc < 0) { error = errno; close(fd); errno = error; return rc; } close(fd); if (flags & FS_IMMUTABLE_FL) return 1; return 0; } int main(int argc, char **argv) { const char *path; char buf[5]; int fd, rc; if (argc < 2) { fprintf(stderr, "usage: %s \n", argv[0]); return EXIT_FAILURE; } path = argv[1]; /* attributes: EFI_VARIABLE_NON_VOLATILE | * EFI_VARIABLE_BOOTSERVICE_ACCESS | * EFI_VARIABLE_RUNTIME_ACCESS */ *(uint32_t *)buf = 0x7; buf[4] = 0; /* create a test variable */ fd = open(path, O_WRONLY | O_CREAT, 0600); if (fd < 0) { perror("open(O_WRONLY)"); return EXIT_FAILURE; } rc = write(fd, buf, sizeof(buf)); if (rc != sizeof(buf)) { perror("write"); return EXIT_FAILURE; } close(fd); rc = get_immutable(path); if (rc < 0) { perror("ioctl(FS_IOC_GETFLAGS)"); return EXIT_FAILURE; } else if (rc) { rc = set_immutable(path, 0); if (rc < 0) { perror("ioctl(FS_IOC_SETFLAGS)"); return EXIT_FAILURE; } } fd = open(path, O_RDONLY); if (fd < 0) { perror("open"); return EXIT_FAILURE; } if (unlink(path) < 0) { perror("unlink"); return EXIT_FAILURE; } rc = read(fd, buf, sizeof(buf)); if (rc > 0) { fprintf(stderr, "reading from an unlinked variable " "shouldn't be possible\n"); return EXIT_FAILURE; } return EXIT_SUCCESS; } 154.h'>
path: root/include/net/cfg802154.h
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authorThomas Gleixner <tglx@linutronix.de>2016-12-25 12:43:07 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-12-25 17:21:23 +0100
commit1f3a8e49d8f28f498b8694464623ac20aebfe62a (patch)
treeda0b5101c3be3e18b55b0a11974f63a3195704f9 /include/net/cfg802154.h
parent8b0e195314fabd58a331c4f7b6db75a1565535d7 (diff)
ktime: Get rid of ktime_equal()
No point in going through loops and hoops instead of just comparing the values. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org>
Diffstat (limited to 'include/net/cfg802154.h')