syscall overhaul part two - unify public and internal syscall interface

with this patch, the syscallN() functions are no longer needed; a
variadic syscall() macro allows syscalls with anywhere from 0 to 6
arguments to be made with a single macro name. also, manually casting
each non-integer argument with (long) is no longer necessary; the
casts are hidden in the macros.

some source files which depended on being able to define the old macro
SYSCALL_RETURNS_ERRNO have been modified to directly use __syscall()
instead of syscall(). references to SYSCALL_SIGSET_SIZE and SYSCALL_LL
have also been changed.

x86_64 has not been tested, and may need a follow-up commit to fix any
minor bugs/oversights.

4 files changed, 4 insertions, 4 deletions

diff --git a/src/unistd/ftruncate.c b/src/unistd/ftruncate.c
index db5da844..f57ea120 100644
--- a/src/unistd/ftruncate.c
+++ b/src/unistd/ftruncate.c
@@ -4,7 +4,7 @@
 
 int ftruncate(int fd, off_t length)
 {
-	return syscall3(__NR_ftruncate, fd, SYSCALL_LL(length));
+	return syscall(__NR_ftruncate, fd, __SYSCALL_LL(length));
 }
 
 LFS64(ftruncate);
diff --git a/src/unistd/pread.c b/src/unistd/pread.c
index 534215ac..16320e2c 100644
--- a/src/unistd/pread.c
+++ b/src/unistd/pread.c
@@ -6,7 +6,7 @@ ssize_t pread(int fd, void *buf, size_t size, off_t ofs)
 {
 	ssize_t r;
 	CANCELPT_BEGIN;
-	r = syscall5(__NR_pread, fd, (long)buf, size, SYSCALL_LL(ofs));
+	r = syscall(__NR_pread, fd, buf, size, __SYSCALL_LL(ofs));
 	CANCELPT_END;
 	return r;
 }
diff --git a/src/unistd/pwrite.c b/src/unistd/pwrite.c
index 56ed6b4c..c4d3aff5 100644
--- a/src/unistd/pwrite.c
+++ b/src/unistd/pwrite.c
@@ -6,7 +6,7 @@ ssize_t pwrite(int fd, const void *buf, size_t size, off_t ofs)
 {
 	ssize_t r;
 	CANCELPT_BEGIN;
-	r = syscall5(__NR_pwrite, fd, (long)buf, size, SYSCALL_LL(ofs));
+	r = syscall(__NR_pwrite, fd, buf, size, __SYSCALL_LL(ofs));
 	CANCELPT_END;
 	return r;
 }
diff --git a/src/unistd/truncate.c b/src/unistd/truncate.c
index 322349d2..3edacd12 100644
--- a/src/unistd/truncate.c
+++ b/src/unistd/truncate.c
@@ -4,7 +4,7 @@
 
 int truncate(const char *path, off_t length)
 {
-	return syscall3(__NR_truncate, (long)path, SYSCALL_LL(length));
+	return syscall(__NR_truncate, path, __SYSCALL_LL(length));
 }
 
 LFS64(truncate);