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libc: set errno on read, write

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This commit is contained in:
K. Lange 2018-12-11 09:42:21 +09:00
parent d21247c98b
commit e2b6f13ba2
3 changed files with 17 additions and 2 deletions
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13
apps/cat.c
View File

@ -19,27 +19,40 @@
#define CHUNK_SIZE 4096
static char * _argv_0;
static char * _file;
void doit(int fd) {
while (1) {
char buf[CHUNK_SIZE];
memset(buf, 0, CHUNK_SIZE);
ssize_t r = read(fd, buf, CHUNK_SIZE);
if (!r) return;
if (r < 0) {
fprintf(stderr, "%s: %s: %s\n", _argv_0, _file, strerror(errno));
return;
}
write(STDOUT_FILENO, buf, r);
}
}
int main(int argc, char ** argv) {
int ret = 0;
_argv_0 = argv[0];
if (argc == 1) {
_file = "stdin";
doit(0);
}
for (int i = 1; i < argc; ++i) {
if (!strcmp(argv[i],"-")) {
_file = "stdin";
doit(0);
continue;
}
_file = argv[i];
int fd = open(argv[i], O_RDONLY);
if (fd < 0) {
fprintf(stderr, "%s: %s: %s\n", argv[0], argv[i], strerror(errno));

3
libc/unistd/read.c
View File

@ -1,9 +1,10 @@
#include <unistd.h>
#include <errno.h>
#include <syscall.h>
#include <syscall_nums.h>
DEFN_SYSCALL3(read, SYS_READ, int, char *, int);
int read(int file, void *ptr, size_t len) {
return syscall_read(file,ptr,len);
__sets_errno(syscall_read(file,ptr,len));
}

3
libc/unistd/write.c
View File

@ -1,9 +1,10 @@
#include <unistd.h>
#include <errno.h>
#include <syscall.h>
#include <syscall_nums.h>
DEFN_SYSCALL3(write, SYS_WRITE, int, char *, int);
ssize_t write(int file, const void *ptr, size_t len) {
return syscall_write(file,(char *)ptr,len);
__sets_errno(syscall_write(file,(char *)ptr,len));
}