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synced 2024-12-22 17:35:35 +03:00
Make fopen_temporary and fopen_temporary_label unlocked
This is partially a refactoring, but also makes many more places use unlocked operations implicitly, i.e. all users of fopen_temporary(). AFAICT, the uses are always for short-lived files which are not shared externally, and are just used within the same context. Locking is not necessary.
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@ -35,3 +35,17 @@ expression f, path, options;
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+ return -ESRCH;
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+ if (r < 0)
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+ return r;
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@@
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expression f, path, p;
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@@
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r = fopen_temporary(path, &f, &p);
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if (r < 0)
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return ...;
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- (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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@@
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expression f, g, path, p;
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@@
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r = fopen_temporary_label(path, g, &f, &p);
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if (r < 0)
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return ...;
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- (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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@ -6,7 +6,6 @@
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#include <limits.h>
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#include <signal.h>
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#include <stddef.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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@ -1,7 +1,5 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <stdio_ext.h>
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#include "alloc-util.h"
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#include "env-file.h"
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#include "env-util.h"
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@ -545,7 +543,6 @@ int write_env_file(const char *fname, char **l) {
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if (r < 0)
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return r;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod_umask(fileno(f), 0644);
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STRV_FOREACH(i, l)
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@ -108,7 +108,6 @@ static int write_string_file_atomic(
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if (r < 0)
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return r;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod_umask(fileno(f), 0644);
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r = write_string_stream_ts(f, line, flags, ts);
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@ -154,11 +153,9 @@ int write_string_file_ts(
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assert(!ts);
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if (flags & WRITE_STRING_FILE_CREATE) {
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f = fopen(fn, "we");
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if (!f) {
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r = -errno;
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r = fopen_unlocked(fn, "we", &f);
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if (r < 0)
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goto fail;
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}
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} else {
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int fd;
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@ -176,9 +173,9 @@ int write_string_file_ts(
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safe_close(fd);
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goto fail;
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}
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}
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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}
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if (flags & WRITE_STRING_FILE_DISABLE_BUFFER)
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setvbuf(f, NULL, _IONBF, 0);
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@ -2,7 +2,6 @@
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio_ext.h>
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#include <sys/mount.h>
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#include "alloc-util.h"
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@ -8,7 +8,6 @@
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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@ -1,5 +1,7 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <sys/mman.h>
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#include "alloc-util.h"
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@ -37,6 +39,9 @@ int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
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return -errno;
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}
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/* This assumes that returned FILE object is short-lived and used within the same single-threaded
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* context and never shared externally, hence locking is not necessary. */
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f = fdopen(fd, "w");
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if (!f) {
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unlink_noerrno(t);
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@ -45,6 +50,8 @@ int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
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return -errno;
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}
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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*_f = f;
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*_temp_path = t;
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@ -1,6 +1,5 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <stdio_ext.h>
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#include <fcntl.h>
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#include "alloc-util.h"
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@ -5,7 +5,6 @@
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio_ext.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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@ -6,7 +6,6 @@
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#include <arpa/inet.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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@ -832,7 +831,6 @@ int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
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if (r < 0)
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goto fail;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f), 0644);
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fprintf(f,
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@ -1,7 +1,6 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <stdio_ext.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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@ -423,7 +422,6 @@ int x11_write_data(Context *c) {
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if (r < 0)
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return r;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f), 0644);
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fputs("# Written by systemd-localed(8), read by systemd-localed and Xorg. It's\n"
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@ -2,7 +2,6 @@
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio_ext.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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@ -97,7 +96,6 @@ int seat_save(Seat *s) {
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if (r < 0)
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goto fail;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f), 0644);
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fprintf(f,
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@ -5,7 +5,6 @@
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#include <linux/kd.h>
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#include <linux/vt.h>
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#include <signal.h>
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#include <stdio_ext.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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@ -214,7 +213,6 @@ int session_save(Session *s) {
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if (r < 0)
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goto fail;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f), 0644);
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fprintf(f,
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@ -3,7 +3,6 @@
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio_ext.h>
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#include "alloc-util.h"
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#include "bus-common-errors.h"
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@ -162,7 +161,6 @@ static int user_save_internal(User *u) {
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if (r < 0)
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goto fail;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f), 0644);
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fprintf(f,
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@ -3,7 +3,6 @@
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio_ext.h>
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#include <sys/stat.h>
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#include "sd-messages.h"
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@ -126,7 +125,6 @@ int machine_save(Machine *m) {
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if (r < 0)
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goto fail;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f), 0644);
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fprintf(f,
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@ -4,7 +4,6 @@
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#include <linux/if.h>
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#include <linux/can/netlink.h>
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#include <unistd.h>
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#include <stdio_ext.h>
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#include "alloc-util.h"
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#include "bus-util.h"
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@ -4034,7 +4033,6 @@ int link_save(Link *link) {
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if (r < 0)
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goto fail;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f), 0644);
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fprintf(f,
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@ -3,7 +3,6 @@
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#include <sys/socket.h>
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#include <linux/if.h>
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#include <linux/fib_rules.h>
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#include <stdio_ext.h>
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#include <unistd.h>
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#include "sd-daemon.h"
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@ -1189,7 +1188,6 @@ static int manager_save(Manager *m) {
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if (r < 0)
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return r;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f), 0644);
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fprintf(f,
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#include <net/if.h>
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#include <linux/if.h>
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#include <stdio_ext.h>
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#include <unistd.h>
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#include "sd-network.h"
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@ -1178,7 +1177,6 @@ int link_save_user(Link *l) {
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if (r < 0)
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goto fail;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f), 0644);
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fputs("# This is private data. Do not parse.\n", f);
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@ -1,7 +1,6 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <resolv.h>
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#include <stdio_ext.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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@ -359,14 +358,12 @@ int manager_write_resolv_conf(Manager *m) {
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if (r < 0)
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return log_warning_errno(r, "Failed to open private resolv.conf file for writing: %m");
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(void) __fsetlocking(f_uplink, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f_uplink), 0644);
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r = fopen_temporary_label(PRIVATE_STUB_RESOLV_CONF, PRIVATE_STUB_RESOLV_CONF, &f_stub, &temp_path_stub);
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if (r < 0)
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return log_warning_errno(r, "Failed to open private stub-resolv.conf file for writing: %m");
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(void) __fsetlocking(f_stub, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f_stub), 0644);
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r = write_uplink_resolv_conf_contents(f_uplink, dns, domains);
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <stdio_ext.h>
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#include <unistd.h>
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#include "alloc-util.h"
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@ -30,23 +29,22 @@ int generator_open_unit_file(
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const char *unit;
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FILE *f;
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int r;
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unit = strjoina(dest, "/", name);
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f = fopen(unit, "wxe");
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if (!f) {
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if (source && errno == EEXIST)
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return log_error_errno(errno,
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r = fopen_unlocked(unit, "wxe", &f);
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if (r < 0) {
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if (source && r == -EEXIST)
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return log_error_errno(r,
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"Failed to create unit file %s, as it already exists. Duplicate entry in %s?",
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unit, source);
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else
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return log_error_errno(errno,
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return log_error_errno(r,
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"Failed to create unit file %s: %m",
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unit);
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}
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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fprintf(f,
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"# Automatically generated by %s\n\n",
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program_invocation_short_name);
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mount.h>
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