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Add epoll and do more release readiness changes

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This change also pays off some of the remaining technical debt with
stdio, file descriptors, and memory managemnt polyfills.
This commit is contained in:
Justine Tunney 2020-11-28 12:01:51 -08:00
parent a9ea949df8
commit 3e4fd4b0ad
271 changed files with 5706 additions and 1365 deletions
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29
libc/stdio/fseek.c
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@ -20,6 +20,7 @@
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/consts/o.h"
/**
* Repositions open file stream.
@ -29,20 +30,32 @@
* is in the EOF state, this function can be used to restore it without
* needing to reopen the file.
*
* @param stream is a non-null stream handle
* @param f is a non-null stream handle
* @param offset is the byte delta
* @param whence can be SEET_SET, SEEK_CUR, or SEEK_END
* @returns new offset or -1 on error
*/
long fseek(FILE *stream, long offset, int whence) {
int skew = fflush(stream);
if (whence == SEEK_CUR && skew != -1) offset -= skew;
long fseek(FILE *f, long offset, int whence) {
int skew;
int64_t newpos;
if ((newpos = lseek(stream->fd, offset, whence)) != -1) {
stream->state = 0;
return newpos;
if (f->fd != -1) {
if (whence == SEEK_CUR && f->beg < f->end) {
offset -= f->end - f->beg;
}
if (f->beg && !f->end) {
f->writer(f);
}
if ((newpos = lseek(f->fd, offset, whence)) != -1) {
f->state = 0;
f->beg = 0;
f->end = 0;
return newpos;
} else {
f->state = errno == ESPIPE ? EBADF : errno;
return -1;
}
} else {
stream->state = errno == ESPIPE ? EBADF : errno;
f->beg = offset % f->size;
return -1;
}
}