musl/src/signal/sigaltstack.c

#include <signal.h>
#include <errno.h>
#include "syscall.h"

int sigaltstack(const stack_t *restrict ss, stack_t *restrict old)
{
	if (ss) {
		if (ss->ss_size < MINSIGSTKSZ) {
			errno = ENOMEM;
			return -1;
		}
		if (ss->ss_flags & ~SS_DISABLE) {
			errno = EINVAL;
			return -1;
		}
	}
	return syscall(SYS_sigaltstack, ss, old);
}
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`#include <signal.h>`
make sigaltstack work (missing macros in signal.h, error conditions) 2011-03-10 10:17:29 -05:00			`#include <errno.h>`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`#include "syscall.h"`

use restrict everywhere it's required by c99 and/or posix 2008 to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict. 2012-09-06 22:44:55 -04:00			`int sigaltstack(const stack_t restrict ss, stack_t restrict old)`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`{`
make sigaltstack work (missing macros in signal.h, error conditions) 2011-03-10 10:17:29 -05:00			`if (ss) {`
			`if (ss->ss_size < MINSIGSTKSZ) {`
			`errno = ENOMEM;`
			`return -1;`
			`}`
			`if (ss->ss_flags & ~SS_DISABLE) {`
			`errno = EINVAL;`
			`return -1;`
			`}`
			`}`
global cleanup to use the new syscall interface 2011-03-20 00:16:43 -04:00			`return syscall(SYS_sigaltstack, ss, old);`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`}`