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abstract missing SYS_pause syscall with macros

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newer archs lack the syscall. the pause() function accounted for this
with its own #ifdef, but that didn't allow use of the syscall directly
elsewhere, so move the logic to macros in src/internal/syscall.h where
it can be shared.
This commit is contained in:
Rich Felker 2024-10-10 17:09:24 -04:00
parent 23ab04a863
commit 6d8000d3c6
2 changed files with 12 additions and 5 deletions
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11
src/internal/syscall.h
View File

@ -391,6 +391,17 @@ static inline long __alt_socketcall(int sys, int sock, int cp, syscall_arg_t a,
#define __sys_open_cp(...) __SYSCALL_DISP(__sys_open_cp,,__VA_ARGS__)
#define sys_open_cp(...) __syscall_ret(__sys_open_cp(__VA_ARGS__))
#ifdef SYS_pause
#define __sys_pause() __syscall(SYS_pause)
#define __sys_pause_cp() __syscall_cp(SYS_pause)
#else
#define __sys_pause() __syscall(SYS_ppoll, 0, 0, 0, 0)
#define __sys_pause_cp() __syscall_cp(SYS_ppoll, 0, 0, 0, 0)
#endif
#define sys_pause() __syscall_ret(__sys_pause())
#define sys_pause_cp() __syscall_ret(__sys_pause_cp())
#ifdef SYS_wait4
#define __sys_wait4(a,b,c,d) __syscall(SYS_wait4,a,b,c,d)
#define __sys_wait4_cp(a,b,c,d) __syscall_cp(SYS_wait4,a,b,c,d)

6
src/unistd/pause.c
View File

@ -3,9 +3,5 @@
int pause(void)
{
#ifdef SYS_pause
return syscall_cp(SYS_pause);
#else
return syscall_cp(SYS_ppoll, 0, 0, 0, 0);
#endif
return sys_pause_cp();
}