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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-03-10 12:26:32 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-07-08 14:08:14 -0300 |
| commit | 607449506f197cc9514408908f41f22537a47a8c (patch) | |
| tree | 9d4304b8a8a1ccdef78a305433d845bcd3e08ae6 /NEWS | |
| parent | 286286283e9bdc7ef894306e2dbcf4c115b97ba2 (diff) | |
| download | glibc-607449506f197cc9514408908f41f22537a47a8c.tar.gz glibc-607449506f197cc9514408908f41f22537a47a8c.tar.xz glibc-607449506f197cc9514408908f41f22537a47a8c.zip | |
io: Add closefrom [BZ #10353]
The function closes all open file descriptors greater than or equal to input argument. Negative values are clamped to 0, i.e, it will close all file descriptors. As indicated by the bug report, this is a common symbol provided by different systems (Solaris, OpenBSD, NetBSD, FreeBSD) and, although its has inherent issues with not taking in consideration internal libc file descriptors (such as syslog), this is also a common feature used in multiple projects [1][2][3][4][5]. The Linux fallback implementation iterates over /proc and close all file descriptors sequentially. Although it was raised the questioning whether getdents on /proc/self/fd might return disjointed entries when file descriptor are closed; it does not seems the case on my testing on multiple kernel (v4.18, v5.4, v5.9) and the same strategy is used on different projects [1][2][3][5]. Also, the interface is set a fail-safe meaning that a failure in the fallback results in a process abort. Checked on x86_64-linux-gnu and i686-linux-gnu on kernel 5.11 and 4.15. [1] https://github.com/systemd/systemd/blob/5238e9575906297608ff802a27e2ff9effa3b338/src/basic/fd-util.c#L217 [2] https://github.com/lxc/lxc/blob/ddf4b77e11a4d08f09b7b9cd13e593f8c047edc5/src/lxc/start.c#L236 [3] https://github.com/python/cpython/blob/9e4f2f3a6b8ee995c365e86d976937c141d867f8/Modules/_posixsubprocess.c#L220 [4] https://github.com/rust-lang/rust/blob/5f47c0613ed4eb46fca3633c1297364c09e5e451/src/libstd/sys/unix/process2.rs#L303-L308 [5] https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjava/childproc.c#L82
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/NEWS b/NEWS index be04b217fe..e01a245ac5 100644 --- a/NEWS +++ b/NEWS @@ -63,6 +63,10 @@ Major new features: * On Linux, the close_range function has been added. It allows efficiently closing a range of file descriptors on recent kernels (version 5.9). +* The function closefrom has been added. It closes all file descriptors + greater than given integer. This function is a GNU extension, although it + also present in other systems. + Deprecated and removed features, and other changes affecting compatibility: * The function pthread_mutex_consistent_np has been deprecated; programs |