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fd_util: avoid unnecessary fcntl() calls

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This commit is contained in:
Max Kellermann 2013-10-29 13:02:53 +01:00
parent 03747ba93e
commit 163848ab3b
1 changed files with 8 additions and 6 deletions
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14
src/system/fd_util.c
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@ -58,15 +58,17 @@
static int static int
fd_mask_flags(int fd, int and_mask, int xor_mask) fd_mask_flags(int fd, int and_mask, int xor_mask)
{ {
int ret;
assert(fd >= 0); assert(fd >= 0);
ret = fcntl(fd, F_GETFD, 0); const int old_flags = fcntl(fd, F_GETFD, 0);
if (ret < 0) if (old_flags < 0)
return ret; return old_flags;
return fcntl(fd, F_SETFD, (ret & and_mask) ^ xor_mask); const int new_flags = (old_flags & and_mask) ^ xor_mask;
if (new_flags == old_flags)
return old_flags;
return fcntl(fd, F_SETFD, new_flags);
} }
#endif /* !WIN32 */ #endif /* !WIN32 */