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start-stop-daemon: set fds to CLOEXEC instead of closing

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Set file descriptors to CLOEXEC instead of closing them before exec,
similar to what we do in supervise-daemon.

Use the share cloexec_fds_from() helper for this.

closefrom() is no longer used so remove the test.
This commit is contained in:
Natanael Copa 2023-08-30 13:20:16 +02:00 committed by William Hubbs
parent c199c5cf6e
commit e447562aaa
2 changed files with 1 additions and 9 deletions
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3
meson.build
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@ -195,9 +195,6 @@ if cc.compiles(malloc_attribute_test, name : 'malloc attribute with arguments')
add_project_arguments('-DHAVE_MALLOC_EXTENDED_ATTRIBUTE', language: 'c')
endif
if cc.has_function('closefrom', prefix: '#define _GNU_SOURCE\n#include <unistd.h>')
add_project_arguments('-DHAVE_CLOSEFROM', language: 'c')
endif
if cc.has_function('close_range', prefix: '#define _GNU_SOURCE\n#include <unistd.h>')
add_project_arguments('-DHAVE_CLOSE_RANGE', language: 'c')
endif

7
src/start-stop-daemon/start-stop-daemon.c
View File

@ -1098,12 +1098,7 @@ int main(int argc, char **argv)
|| rc_yesno(getenv("EINFO_QUIET")))
dup2(stderr_fd, STDERR_FILENO);
#ifdef HAVE_CLOSEFROM
closefrom(3);
#else
for (i = getdtablesize() - 1; i >= 3; --i)
close(i);
#endif
cloexec_fds_from(3);
if (scheduler != NULL) {
int scheduler_index;