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find: use sysconf(_SC_ARG_MAX) to determine the command-line size limit

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The find utility uses a hardcoded value of 32 * 1024 as the limit of
the command-line length when calling 'find -exec ... {} +'. This results
in over 4 times more execve() calls than in coreutils' find.

This patch uses the limit defined in system headers.

Based on the patch by  Bartosz Golaszewski <bartekgola@gmail.com>.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2014-06-22 13:54:40 +02:00
parent 6be3a5242c
commit f92f1d0181
5 changed files with 38 additions and 17 deletions
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8
include/libbb.h
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@ -731,6 +731,14 @@ extern void *xmalloc_open_read_close(const char *filename, size_t *maxsz_p) FAST
/* Never returns NULL */
extern void *xmalloc_xopen_read_close(const char *filename, size_t *maxsz_p) FAST_FUNC RETURNS_MALLOC;
#if defined ARG_MAX
# define bb_arg_max() ((unsigned)ARG_MAX)
#elif defined _SC_ARG_MAX
unsigned bb_arg_max(void) FAST_FUNC;
#else
# define bb_arg_max() ((unsigned)(32 * 1024))
#endif
#define SEAMLESS_COMPRESSION (0 \
|| ENABLE_FEATURE_SEAMLESS_XZ \
|| ENABLE_FEATURE_SEAMLESS_LZMA \