1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
/*
* Set and clear the FD_CLOEXEC fcntl option on a file descriptor.
*
* We don't realistically expect these operations to fail (the most
* plausible error condition is EBADF, but we always believe ourselves
* to be passing a valid fd so even that's an assertion-fail sort of
* response), so we don't make any effort to return sensible error
* codes to the caller - we just log to standard error and die
* unceremoniously.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include "putty.h"
void cloexec(int fd)
{
int fdflags;
fdflags = fcntl(fd, F_GETFD);
if (fdflags < 0) {
fprintf(stderr, "%d: fcntl(F_GETFD): %s\n", fd, strerror(errno));
exit(1);
}
if (fcntl(fd, F_SETFD, fdflags | FD_CLOEXEC) < 0) {
fprintf(stderr, "%d: fcntl(F_SETFD): %s\n", fd, strerror(errno));
exit(1);
}
}
void noncloexec(int fd)
{
int fdflags;
fdflags = fcntl(fd, F_GETFD);
if (fdflags < 0) {
fprintf(stderr, "%d: fcntl(F_GETFD): %s\n", fd, strerror(errno));
exit(1);
}
if (fcntl(fd, F_SETFD, fdflags & ~FD_CLOEXEC) < 0) {
fprintf(stderr, "%d: fcntl(F_SETFD): %s\n", fd, strerror(errno));
exit(1);
}
}
|
