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fd-util: add macro for generating /proc/self/fd/ paths on the fly

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This commit is contained in:
Lennart Poettering 2021-08-18 09:43:07 +02:00
parent 3832cb90ba
commit 6e1e4b59f9
1 changed files with 15 additions and 1 deletions
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16
src/basic/fd-util.h
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@ -7,6 +7,7 @@
#include <sys/socket.h>
#include "macro.h"
#include "stdio-util.h"
/* maximum length of fdname */
#define FDNAME_MAX 255
@ -104,7 +105,20 @@ static inline int make_null_stdio(void) {
0; \
})
int fd_reopen(int fd, int flags);
int read_nr_open(void);
int btrfs_defrag_fd(int fd);
/* The maximum length a buffer for a /proc/self/fd/<fd> path needs */
#define PROC_FD_PATH_MAX \
(STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int))
static inline char *format_proc_fd_path(char buf[static PROC_FD_PATH_MAX], int fd) {
assert(buf);
assert(fd >= 0);
assert_se(snprintf_ok(buf, PROC_FD_PATH_MAX, "/proc/self/fd/%i", fd));
return buf;
}
#define FORMAT_PROC_FD_PATH(fd) \
format_proc_fd_path((char[PROC_FD_PATH_MAX]) {}, (fd))