| Absolute File Name: | /home/opencoverage/opencoverage/guest-scripts/coreutils/src/gnulib/lib/cloexec.c |
| Source code | Switch to Preprocessed file |
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| 1 | /* cloexec.c - set or clear the close-on-exec descriptor flag | - | ||||||
| 2 | - | |||||||
| 3 | Copyright (C) 1991, 2004-2006, 2009-2018 Free Software Foundation, Inc. | - | ||||||
| 4 | - | |||||||
| 5 | This program is free software: you can redistribute it and/or modify | - | ||||||
| 6 | it under the terms of the GNU General Public License as published by | - | ||||||
| 7 | the Free Software Foundation; either version 3 of the License, or | - | ||||||
| 8 | (at your option) any later version. | - | ||||||
| 9 | - | |||||||
| 10 | This program is distributed in the hope that it will be useful, | - | ||||||
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | - | ||||||
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | - | ||||||
| 13 | GNU General Public License for more details. | - | ||||||
| 14 | - | |||||||
| 15 | You should have received a copy of the GNU General Public License | - | ||||||
| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. | - | ||||||
| 17 | - | |||||||
| 18 | The code is taken from glibc/manual/llio.texi */ | - | ||||||
| 19 | - | |||||||
| 20 | #include <config.h> | - | ||||||
| 21 | - | |||||||
| 22 | #include "cloexec.h" | - | ||||||
| 23 | - | |||||||
| 24 | #include <errno.h> | - | ||||||
| 25 | #include <fcntl.h> | - | ||||||
| 26 | #include <unistd.h> | - | ||||||
| 27 | - | |||||||
| 28 | /* Set the 'FD_CLOEXEC' flag of DESC if VALUE is true, | - | ||||||
| 29 | or clear the flag if VALUE is false. | - | ||||||
| 30 | Return 0 on success, or -1 on error with 'errno' set. | - | ||||||
| 31 | - | |||||||
| 32 | Note that on MingW, this function does NOT protect DESC from being | - | ||||||
| 33 | inherited into spawned children. Instead, either use dup_cloexec | - | ||||||
| 34 | followed by closing the original DESC, or use interfaces such as | - | ||||||
| 35 | open or pipe2 that accept flags like O_CLOEXEC to create DESC | - | ||||||
| 36 | non-inheritable in the first place. */ | - | ||||||
| 37 | - | |||||||
| 38 | int | - | ||||||
| 39 | set_cloexec_flag (int desc, bool value) | - | ||||||
| 40 | { | - | ||||||
| 41 | #ifdef F_SETFD | - | ||||||
| 42 | - | |||||||
| 43 | int flags = fcntl (desc, F_GETFD, 0); | - | ||||||
| 44 | - | |||||||
| 45 | if (0 <= flags)
| 0 | ||||||
| 46 | { | - | ||||||
| 47 | int newflags = (value ? flags | FD_CLOEXEC : flags & ~FD_CLOEXEC);
| 0 | ||||||
| 48 | - | |||||||
| 49 | if (flags == newflags
| 0 | ||||||
| 50 | || fcntl (desc, F_SETFD, newflags) != -1)
| 0 | ||||||
| 51 | return 0; never executed: return 0; | 0 | ||||||
| 52 | } never executed: end of block | 0 | ||||||
| 53 | - | |||||||
| 54 | return -1; never executed: return -1; | 0 | ||||||
| 55 | - | |||||||
| 56 | #else /* !F_SETFD */ | - | ||||||
| 57 | - | |||||||
| 58 | /* Use dup2 to reject invalid file descriptors; the cloexec flag | - | ||||||
| 59 | will be unaffected. */ | - | ||||||
| 60 | if (desc < 0) | - | ||||||
| 61 | { | - | ||||||
| 62 | errno = EBADF; | - | ||||||
| 63 | return -1; | - | ||||||
| 64 | } | - | ||||||
| 65 | if (dup2 (desc, desc) < 0) | - | ||||||
| 66 | /* errno is EBADF here. */ | - | ||||||
| 67 | return -1; | - | ||||||
| 68 | - | |||||||
| 69 | /* There is nothing we can do on this kind of platform. Punt. */ | - | ||||||
| 70 | return 0; | - | ||||||
| 71 | #endif /* !F_SETFD */ | - | ||||||
| 72 | } | - | ||||||
| 73 | - | |||||||
| 74 | - | |||||||
| 75 | /* Duplicates a file handle FD, while marking the copy to be closed | - | ||||||
| 76 | prior to exec or spawn. Returns -1 and sets errno if FD could not | - | ||||||
| 77 | be duplicated. */ | - | ||||||
| 78 | - | |||||||
| 79 | int | - | ||||||
| 80 | dup_cloexec (int fd) | - | ||||||
| 81 | { | - | ||||||
| 82 | return fcntl (fd, F_DUPFD_CLOEXEC, 0); never executed: return rpl_fcntl (fd, 1030 , 0); | 0 | ||||||
| 83 | } | - | ||||||
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