path: root/include
diff options
authorRich Felker <>2018-09-10 16:13:29 -0400
committerRich Felker <>2018-09-12 14:34:32 -0400
commitfe61a7aa53e68e8a17b5eb8d502e6fa314139ced (patch)
tree76624120cdf978e0d5c3a995d27e09eeba1a1151 /include
parent039f1b3c564667ab6fc9955bd892c2e527eb80b0 (diff)
rework mechanism for posix_spawnp calling posix_spawn
previously, a common __posix_spawnx backend was used that accepted an additional argument for the execve variant to call in the child. this moderately bloated up the posix_spawn function, shuffling arguments between stack and/or registers to call a 7-argument function from a 6-argument one. instead, tuck the exec function pointer in an unused part of the (large) pthread_spawnattr_t structure, and have posix_spawnp duplicate the attributes and fill in a pointer to __execvpe. the net code size change is minimal, but the weight is shifted to the "heavier" function which already pulls in more dependencies. as a bonus, we get rid of an external symbol (__posix_spawnx) that had no really good place for a declaration because it shouldn't have existed to begin with.
Diffstat (limited to 'include')
1 files changed, 3 insertions, 1 deletions
diff --git a/include/spawn.h b/include/spawn.h
index bba57ce4..c9bd1939 100644
--- a/include/spawn.h
+++ b/include/spawn.h
@@ -28,7 +28,9 @@ typedef struct {
int __flags;
pid_t __pgrp;
sigset_t __def, __mask;
- int __prio, __pol, __pad[16];
+ int __prio, __pol;
+ void *__fn;
+ char __pad[64-sizeof(void *)];
} posix_spawnattr_t;
typedef struct {