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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
commit | 5e61585d76ae77fd5e9e96ebabb57afa4d74880d (patch) | |
tree | 2b467823aaeebc7ef8bc9e3cabe8074eaef1666d /src/util/close_on_exec.c | |
parent | Initial commit. (diff) | |
download | postfix-5e61585d76ae77fd5e9e96ebabb57afa4d74880d.tar.xz postfix-5e61585d76ae77fd5e9e96ebabb57afa4d74880d.zip |
Adding upstream version 3.5.24.upstream/3.5.24upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/util/close_on_exec.c')
-rw-r--r-- | src/util/close_on_exec.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/util/close_on_exec.c b/src/util/close_on_exec.c new file mode 100644 index 0000000..efa3415 --- /dev/null +++ b/src/util/close_on_exec.c @@ -0,0 +1,60 @@ +/*++ +/* NAME +/* close_on_exec 3 +/* SUMMARY +/* set/clear close-on-exec flag +/* SYNOPSIS +/* #include <iostuff.h> +/* +/* int close_on_exec(int fd, int on) +/* DESCRIPTION +/* the \fIclose_on_exec\fR() function manipulates the close-on-exec +/* flag for the specified open file, and returns the old setting. +/* +/* Arguments: +/* .IP fd +/* A file descriptor. +/* .IP on +/* Use CLOSE_ON_EXEC or PASS_ON_EXEC. +/* DIAGNOSTICS +/* All errors are fatal. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System interfaces. */ + +#include <sys_defs.h> +#include <fcntl.h> + +/* Utility library. */ + +#include "msg.h" + +/* Application-specific. */ + +#include "iostuff.h" + +#define PATTERN FD_CLOEXEC + +/* close_on_exec - set/clear close-on-exec flag */ + +int close_on_exec(fd, on) +int fd; +int on; +{ + int flags; + + if ((flags = fcntl(fd, F_GETFD, 0)) < 0) + msg_fatal("fcntl: get flags: %m"); + if (fcntl(fd, F_SETFD, on ? flags | PATTERN : flags & ~PATTERN) < 0) + msg_fatal("fcntl: set close-on-exec flag %s: %m", on ? "on" : "off"); + return ((flags & PATTERN) != 0); +} |