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manager: define a string constant for LONG_MAX and use that for sysctl

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This moves the formatting of the constant to compilation time and let's us
avoid asprintf() in the very hot path of initial boot.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2022-12-03 11:55:55 +01:00
parent b47e0fac03
commit a5fac1df27
2 changed files with 5 additions and 1 deletions
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4
meson.build
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@ -510,6 +510,10 @@ conf.set('SIZEOF_TIME_T', cc.sizeof('time_t', prefix : '#include <sys/time.h>'))
conf.set('SIZEOF_RLIM_T', cc.sizeof('rlim_t', prefix : '#include <sys/resource.h>'))
conf.set('SIZEOF_TIMEX_MEMBER', cc.sizeof('typeof(((struct timex *)0)->freq)', prefix : '#include <sys/timex.h>'))
long_max = cc.compute_int('LONG_MAX', prefix : '#include <limits.h>')
assert(long_max > 100000)
conf.set_quoted('LONG_MAX_STR', '@0@'.format(long_max))
decl_headers = '''
#include <uchar.h>
#include <sys/mount.h>

2
src/core/main.c
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@ -1184,7 +1184,7 @@ static void bump_file_max_and_nr_open(void) {
#if BUMP_PROC_SYS_FS_FILE_MAX
/* The maximum the kernel allows for this since 5.2 is LONG_MAX, use that. (Previously things were
* different, but the operation would fail silently.) */
r = sysctl_writef("fs/file-max", "%li", LONG_MAX);
r = sysctl_write("fs/file-max", LONG_MAX_STR);
if (r < 0)
log_full_errno(IN_SET(r, -EROFS, -EPERM, -EACCES) ? LOG_DEBUG : LOG_WARNING,
r, "Failed to bump fs.file-max, ignoring: %m");