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fd-util: Expose helper to pack fds into 3,4,5,...

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This is useful for situations where an array of FDs is to be passed into
a child process (i.e. by passing it through safe_fork). This function
can be called in the child (before calling exec) to pack the FDs to all
be next to each-other starting from SD_LISTEN_FDS_START (i.e. 3)
This commit is contained in:
Adrian Vovk
2024-02-19 11:18:11 +00:00
committed by Luca Boccassi
parent 034569150f
commit 85f660d46b
6 changed files with 82 additions and 48 deletions
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src/basic/process-util.h
+15 -3
View File
@@ -185,12 +185,13 @@ typedef enum ForkFlags {
FORK_KEEP_NOTIFY_SOCKET = 1 << 17, /* Unless this specified, $NOTIFY_SOCKET will be unset. */
FORK_DETACH = 1 << 18, /* Double fork if needed to ensure PID1/subreaper is parent */
FORK_NEW_NETNS = 1 << 19, /* Run child in its own network namespace 💣 DO NOT USE IN THREADED PROGRAMS! 💣 */
FORK_PACK_FDS = 1 << 20, /* Rearrange the passed FDs to be FD 3,4,5,etc. Updates the array in place (combine with FORK_CLOSE_ALL_FDS!) */
} ForkFlags;
int safe_fork_full(
const char *name,
const int stdio_fds[3],
const int except_fds[],
int except_fds[],
size_t n_except_fds,
ForkFlags flags,
pid_t *ret_pid);
@@ -202,7 +203,7 @@ static inline int safe_fork(const char *name, ForkFlags flags, pid_t *ret_pid) {
int pidref_safe_fork_full(
const char *name,
const int stdio_fds[3],
const int except_fds[],
int except_fds[],
size_t n_except_fds,
ForkFlags flags,
PidRef *ret_pid);
@@ -211,7 +212,18 @@ static inline int pidref_safe_fork(const char *name, ForkFlags flags, PidRef *re
return pidref_safe_fork_full(name, NULL, NULL, 0, flags, ret_pid);
}
int namespace_fork(const char *outer_name, const char *inner_name, const int except_fds[], size_t n_except_fds, ForkFlags flags, int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int root_fd, pid_t *ret_pid);
int namespace_fork(
const char *outer_name,
const char *inner_name,
int except_fds[],
size_t n_except_fds,
ForkFlags flags,
int pidns_fd,
int mntns_fd,
int netns_fd,
int userns_fd,
int root_fd,
pid_t *ret_pid);
int set_oom_score_adjust(int value);
int get_oom_score_adjust(int *ret);