diff options
Diffstat (limited to 'user/include/unistd.h')
| -rw-r--r-- | user/include/unistd.h | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/user/include/unistd.h b/user/include/unistd.h index cad3a81..4f582d2 100644 --- a/user/include/unistd.h +++ b/user/include/unistd.h @@ -11,11 +11,10 @@ #include <stdint.h> #include <stddef.h> +#include <sys/types.h> /* System Call Definitions */ -typedef unsigned short pid_t; - enum { S_SET = 0, S_CUR = 1, @@ -27,7 +26,7 @@ enum { O_RDONLY = 0x02, O_WRONLY = 0x04, O_APPEND = 0x08, - O_RDWR = O_RDONLY | O_WRONLY, + O_RDWR = 0x010, }; /** @@ -67,11 +66,9 @@ extern int fork(void); * * @param prog - program table index of the program to exec * @param args - the command-line argument vector - * - * Does not return if it succeeds; if it returns, something has - * gone wrong. + * @returns error code on failure */ -extern void exec(const char *filename, char **args); +extern int exec(const char *filename, const char **args); /** * open a stream with a given filename @@ -85,8 +82,9 @@ extern int open(const char *filename, int flags); * closes a stream with the given file descriptior * * @param fd - the file descriptior of the open stream + * @returns 0 on success, error code on invalid fd */ -extern void close(int fd); +extern int close(int fd); /** * read into a buffer from a stream @@ -116,7 +114,7 @@ extern int write(int fd, const void *buffer, size_t nbytes); * @param whence - whence to seek * @return 0 on success, or an error code */ -extern int seek(int fd, long int off, int whence); +extern off_t seek(int fd, off_t off, int whence); /** * gets the pid of the calling process |