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Update nl_io wrappers return to set errno

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Harshit-Dhanwalkar 2026-06-21 19:10:53 +05:30
parent 2d75b96c39
commit ff1ec552da
1 changed files with 77 additions and 15 deletions
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92
C/lib/nl_io.h
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@ -14,22 +14,56 @@
#define MAP_FAILED ((void *)-1)
#endif
#include "nl_syscall.h"
// Basic I/O
static inline ssize_t nl_write(int fd, const void *buf, size_t n) {
return (ssize_t)__sc3(SYS_write, fd, (long)buf, (long)n);
long ret = __sc3(SYS_write, fd, (long)buf, (long)n);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return (ssize_t)ret;
}
static inline ssize_t nl_read(int fd, void *buf, size_t n) {
return (ssize_t)__sc3(SYS_read, fd, (long)buf, (long)n);
long ret = __sc3(SYS_read, fd, (long)buf, (long)n);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return (ssize_t)ret;
}
static inline int nl_open(const char *path, int flags, int mode) {
return (int)__sc3(SYS_open, (long)path, flags, mode);
long ret = __sc3(SYS_open, (long)path, flags, mode);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return (int)ret;
}
static inline int nl_close(int fd) {
long ret = __sc1(SYS_close, fd);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return 0;
}
static inline int nl_close(int fd) { return (int)__sc1(SYS_close, fd); }
static inline int nl_unlink(const char *path) {
return (int)__sc1(SYS_unlink, (long)path);
long ret = __sc1(SYS_unlink, (long)path);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return (int)ret;
}
static inline int nl_ioctl(int fd, unsigned long req, void *arg) {
return (int)__sc3(SYS_ioctl, fd, (long)req, (long)arg);
long ret = __sc3(SYS_ioctl, fd, (long)req, (long)arg);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return (int)ret;
}
// fprintf / stderr
@ -48,10 +82,20 @@ static inline int nl_ioctl(int fd, unsigned long req, void *arg) {
// mmap / munmap
static inline void *nl_mmap(void *addr, size_t len, int prot, int flags, int fd,
long off) {
return (void *)__sc6(SYS_mmap, (long)addr, (long)len, prot, flags, fd, off);
long ret = __sc6(SYS_mmap, (long)addr, (long)len, prot, flags, fd, off);
if (ret < 0) {
errno = (int)-ret;
return MAP_FAILED;
}
return (void *)ret;
}
static inline int nl_munmap(void *addr, size_t len) {
return (int)__sc2(SYS_munmap, (long)addr, (long)len);
long ret = __sc2(SYS_munmap, (long)addr, (long)len);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return (int)ret;
}
// select
@ -67,9 +111,18 @@ typedef struct {
#define NL_FD_SET(fd, s) ((s)->fds_bits[(fd) / 64] |= (1UL << ((fd) % 64)))
#define NL_FD_ISSET(fd, s) ((s)->fds_bits[(fd) / 64] & (1UL << ((fd) % 64)))
#define FD_ZERO(s) NL_FD_ZERO(s)
#define FD_SET(fd, s) NL_FD_SET(fd, s)
#define FD_ISSET(fd, s) NL_FD_ISSET(fd, s)
static inline int nl_select(int nfds, nl_fd_set *r, nl_fd_set *w, nl_fd_set *e,
struct nl_timeval *tv) {
return (int)__sc6(SYS_select, nfds, (long)r, (long)w, (long)e, (long)tv, 0);
long ret = __sc6(SYS_select, nfds, (long)r, (long)w, (long)e, (long)tv, 0);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return (int)ret;
}
// clock / sleep
@ -78,9 +131,9 @@ static inline int nl_clock_gettime(clockid_t id, struct timespec *ts) {
}
static inline int nl_nanosleep(const struct timespec *req,
struct timespec *rem) {
long r = __sc2(SYS_nanosleep, (long)req, (long)rem);
if (r < 0) {
errno = (int)-r;
long ret = __sc2(SYS_nanosleep, (long)req, (long)rem);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return 0;
@ -97,11 +150,21 @@ static inline void nl_exit(int code) {
// inotify
static inline int nl_inotify_init1(int flags) {
return (int)__sc1(SYS_inotify_init1, flags);
long ret = __sc1(SYS_inotify_init1, flags);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return (int)ret;
}
static inline int nl_inotify_add_watch(int fd, const char *path,
uint32_t mask) {
return (int)__sc3(SYS_inotify_add_watch, fd, (long)path, mask);
long ret = __sc3(SYS_inotify_add_watch, fd, (long)path, mask);
if (ret < 0) {
errno = (int)-ret;
return -1;
}
return (int)ret;
}
// termios via ioctl
@ -144,7 +207,6 @@ static inline int nl_tcsetattr(int fd, int action, const struct termios *t) {
#define inotify_add_watch(f, p, m) nl_inotify_add_watch(f, p, m)
#else
// #include <sys/mmap.h>
#include <sys/select.h>
#include <unistd.h>
#endif