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fd-util: add new FORMAT_PROC_PID_FD_PATH() helper

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This is just like FORMAT_PROC_FD_PATH() but goes via the PID number
rather than the "self" symlink.

This is useful whenever we want to generate a path that is useful
outside of our local scope.
This commit is contained in:
Lennart Poettering 2023-11-02 11:31:13 +01:00
parent c13e6c720d
commit 61c062f896
2 changed files with 18 additions and 0 deletions
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8
src/basic/fd-util.c
View File

@ -988,3 +988,11 @@ const char *accmode_to_string(int flags) {
return NULL;
}
}
char *format_proc_pid_fd_path(char buf[static PROC_PID_FD_PATH_MAX], pid_t pid, int fd) {
assert(buf);
assert(fd >= 0);
assert(pid >= 0);
assert_se(snprintf_ok(buf, PROC_PID_FD_PATH_MAX, "/proc/" PID_FMT "/fd/%i", pid == 0 ? getpid_cached() : pid, fd));
return buf;
}

10
src/basic/fd-util.h
View File

@ -131,6 +131,16 @@ static inline char *format_proc_fd_path(char buf[static PROC_FD_PATH_MAX], int f
#define FORMAT_PROC_FD_PATH(fd) \
format_proc_fd_path((char[PROC_FD_PATH_MAX]) {}, (fd))
/* The maximum length a buffer for a /proc/<pid>/fd/<fd> path needs */
#define PROC_PID_FD_PATH_MAX \
(STRLEN("/proc//fd/") + DECIMAL_STR_MAX(pid_t) + DECIMAL_STR_MAX(int))
char *format_proc_pid_fd_path(char buf[static PROC_PID_FD_PATH_MAX], pid_t pid, int fd);
/* Kinda the same as FORMAT_PROC_FD_PATH(), but goes by PID rather than "self" symlink */
#define FORMAT_PROC_PID_FD_PATH(pid, fd) \
format_proc_pid_fd_path((char[PROC_PID_FD_PATH_MAX]) {}, (pid), (fd))
const char *accmode_to_string(int flags);
/* Like ASSERT_PTR, but for fds */