diff options
| author | Natanael Copa <ncopa@alpinelinux.org> | 2023-08-30 13:17:07 +0200 |
|---|---|---|
| committer | William Hubbs <w.d.hubbs@gmail.com> | 2023-09-12 22:53:12 -0500 |
| commit | c199c5cf6e39d6e21b92bddba7beeebcc3afca79 (patch) | |
| tree | 2c6f39ffe0f23aace0e70e8766fc731af3ba0f80 /src/shared | |
| parent | 5bfb592d75f2e2ccfc94cb510c5eca755767dfbb (diff) | |
misc: add cloexec_fds_from() helper function
Move logic to set file descriptors to a cloexec_fds_from() function in
misc.c so it can be shared by both supervisor-daemon and
start-stop-daemon, and hide the details behind.
Diffstat (limited to 'src/shared')
| -rw-r--r-- | src/shared/misc.c | 27 | ||||
| -rw-r--r-- | src/shared/misc.h | 2 |
2 files changed, 29 insertions, 0 deletions
diff --git a/src/shared/misc.c b/src/shared/misc.c index c987ce8c..429407d4 100644 --- a/src/shared/misc.c +++ b/src/shared/misc.c @@ -15,6 +15,11 @@ * except according to the terms contained in the LICENSE file. */ +#ifdef HAVE_CLOSE_RANGE +/* For close_range() */ +# define _GNU_SOURCE +#endif + #include <ctype.h> #include <errno.h> #include <fcntl.h> @@ -500,3 +505,25 @@ pid_t get_pid(const char *applet,const char *pidfile) return pid; } + +#ifndef HAVE_CLOSE_RANGE +static inline int close_range(int first RC_UNUSED, + int last RC_UNUSED, + unsigned int flags RC_UNUSED) +{ + return -1; +} +#endif +#ifndef CLOSE_RANGE_CLOEXEC +# define CLOSE_RANGE_CLOEXEC (1U << 2) +#endif + +void +cloexec_fds_from(int first) +{ + int i; + if (close_range(first, UINT_MAX, CLOSE_RANGE_CLOEXEC) < 0) { + for (i = getdtablesize() - 1; i >= first; --i) + fcntl(i, F_SETFD, FD_CLOEXEC); + } +} diff --git a/src/shared/misc.h b/src/shared/misc.h index f4ab25ad..b158a786 100644 --- a/src/shared/misc.h +++ b/src/shared/misc.h @@ -73,4 +73,6 @@ void from_time_t(char *time_string, time_t tv); time_t to_time_t(char *timestring); pid_t get_pid(const char *applet, const char *pidfile); +void cloexec_fds_from(int); + #endif |