fix various errors in function signatures/prototypes found by nsz

include/aio.h

@@ -43,10 +43,10 @@ struct aiocb {
 
 ssize_t aio_read(struct aiocb *);
 ssize_t aio_write(struct aiocb *);
-int aio_error(struct aiocb *);
+int aio_error(const struct aiocb *);
 ssize_t aio_return(struct aiocb *);
 int aio_cancel(int, struct aiocb *);
-int aio_suspend(struct aiocb *const [], int, const struct timespec *);
+int aio_suspend(const struct aiocb *const [], int, const struct timespec *);
 int aio_fsync(int, struct aiocb *);
 
 int lio_listio(int, struct aiocb *const [], int, struct sigevent *);

include/spawn.h

@@ -34,9 +34,9 @@ typedef struct {
 } posix_spawn_file_actions_t;
 
 int posix_spawn(pid_t *, const char *, const posix_spawn_file_actions_t *,
-	const posix_spawnattr_t *, char **, char **);
+	const posix_spawnattr_t *, char *const [], char *const []);
 int posix_spawnp(pid_t *, const char *, const posix_spawn_file_actions_t *,
-	const posix_spawnattr_t *, char **, char **);
+	const posix_spawnattr_t *, char *const [], char *const []);
 
 int posix_spawnattr_init(posix_spawnattr_t *);
 int posix_spawnattr_destroy(posix_spawnattr_t *);

include/time.h

@@ -102,7 +102,7 @@ extern int daylight;
 extern long timezone;
 extern char *tzname[2];
 extern int getdate_err;
-extern struct tm *getdate (const char *);
+struct tm *getdate (const char *);
 #endif
 
 

include/unistd.h

@@ -55,8 +55,8 @@ int link(const char *, const char *);
 int linkat(int, const char *, int, const char *, int);
 int symlink(const char *, const char *);
 int symlinkat(const char *, int, const char *);
-int readlink(const char *, char *, size_t);
-int readlinkat(int, const char *, char *, size_t);
+ssize_t readlink(const char *, char *, size_t);
+ssize_t readlinkat(int, const char *, char *, size_t);
 int unlink(const char *);
 int unlinkat(int, const char *, int);
 int rmdir(const char *);
@@ -134,7 +134,7 @@ size_t confstr(int, char *, size_t);
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
 int lockf(int, int, off_t);
-int setpgrp(void);
+pid_t setpgrp(void);
 char *crypt(const char *, const char *);
 void encrypt(char *, int);
 void swab(const void *, void *, ssize_t);

src/aio/aio_suspend.c

@@ -16,7 +16,7 @@ void __aio_wake(void)
 	__wake(&seq, -1, 1);
 }
 
-int aio_suspend(struct aiocb *const cbs[], int cnt, const struct timespec *ts)
+int aio_suspend(const struct aiocb *const cbs[], int cnt, const struct timespec *ts)
 {
 	int i, last, first=1, ret=0;
 	struct timespec at;

src/process/posix_spawn.c

@@ -11,7 +11,8 @@ extern char **environ;
 int __posix_spawnx(pid_t *res, const char *path,
 	int (*exec)(const char *, char *const *),
 	const posix_spawn_file_actions_t *fa,
-	const posix_spawnattr_t *attr, char **argv, char **envp)
+	const posix_spawnattr_t *attr,
+	char *const argv[], char *const envp[])
 {
 	pid_t pid;
 	sigset_t oldmask;
@@ -81,7 +82,7 @@ int __posix_spawnx(pid_t *res, const char *path,
 	sigprocmask(SIG_SETMASK, (attr->__flags & POSIX_SPAWN_SETSIGMASK)
 		? &attr->__mask : &oldmask, 0);
 
-	if (envp) environ = envp;
+	if (envp) environ = (char **)envp;
 	exec(path, argv);
 	_exit(127);
 
@@ -90,7 +91,8 @@ int __posix_spawnx(pid_t *res, const char *path,
 
 int posix_spawn(pid_t *res, const char *path,
 	const posix_spawn_file_actions_t *fa,
-	const posix_spawnattr_t *attr, char **argv, char **envp)
+	const posix_spawnattr_t *attr,
+	char *const argv[], char *const envp[])
 {
 	return __posix_spawnx(res, path, execv, fa, attr, argv, envp);
 }

src/process/posix_spawnp.c

@@ -4,11 +4,12 @@
 int __posix_spawnx(pid_t *, const char *,
 	int (*)(const char *, char *const *),
 	const posix_spawn_file_actions_t *,
-	const posix_spawnattr_t *, char **, char **);
+	const posix_spawnattr_t *, char *const [], char *const []);
 
 int posix_spawnp(pid_t *res, const char *file,
 	const posix_spawn_file_actions_t *fa,
-	const posix_spawnattr_t *attr, char **argv, char **envp)
+	const posix_spawnattr_t *attr,
+	char *const argv[], char *const envp[])
 {
 	return __posix_spawnx(res, file, execvp, fa, attr, argv, envp);
 }

src/unistd/readlink.c

@@ -1,7 +1,7 @@
 #include <unistd.h>
 #include "syscall.h"
 
-int readlink(const char *path, char *buf, size_t bufsize)
+ssize_t readlink(const char *path, char *buf, size_t bufsize)
 {
 	return syscall(SYS_readlink, path, buf, bufsize);
 }

src/unistd/readlinkat.c

@@ -1,7 +1,7 @@
 #include <unistd.h>
 #include "syscall.h"
 
-int readlinkat(int fd, const char *path, char *buf, size_t bufsize)
+ssize_t readlinkat(int fd, const char *path, char *buf, size_t bufsize)
 {
 	return syscall(SYS_readlinkat, fd, path, buf, bufsize);
 }