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93d26e4cb9
We have a number of badly checked read() calls. Often we are expecting read() to read exactly the size we requested or fail, this fails to handle interrupts or short reads. Add a read_in_full() providing those semantics. Otherwise we at a minimum need to check for EINTR and EAGAIN, where this is appropriate use xread(). Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
114 lines
1.9 KiB
C
114 lines
1.9 KiB
C
#include "cache.h"
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int read_in_full(int fd, void *buf, size_t count)
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{
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char *p = buf;
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ssize_t total = 0;
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ssize_t loaded = 0;
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while (count > 0) {
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loaded = xread(fd, p, count);
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if (loaded <= 0) {
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if (total)
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return total;
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else
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return loaded;
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}
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count -= loaded;
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p += loaded;
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total += loaded;
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}
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return total;
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}
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void read_or_die(int fd, void *buf, size_t count)
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{
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ssize_t loaded;
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loaded = read_in_full(fd, buf, count);
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if (loaded == 0)
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die("unexpected end of file");
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else if (loaded < 0)
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die("read error (%s)", strerror(errno));
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}
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void write_or_die(int fd, const void *buf, size_t count)
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{
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const char *p = buf;
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ssize_t written;
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while (count > 0) {
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written = xwrite(fd, p, count);
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if (written == 0)
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die("disk full?");
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else if (written < 0) {
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if (errno == EPIPE)
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exit(0);
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die("write error (%s)", strerror(errno));
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}
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count -= written;
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p += written;
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}
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}
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int write_in_full(int fd, const void *buf, size_t count)
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{
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const char *p = buf;
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ssize_t total = 0;
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ssize_t wcount = 0;
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while (count > 0) {
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wcount = xwrite(fd, p, count);
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if (wcount <= 0) {
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if (total)
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return total;
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else
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return wcount;
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}
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count -= wcount;
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p += wcount;
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total += wcount;
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}
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return wcount;
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}
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int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
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{
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ssize_t written;
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written = write_in_full(fd, buf, count);
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if (written == 0) {
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fprintf(stderr, "%s: disk full?\n", msg);
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return 0;
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}
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else if (written < 0) {
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if (errno == EPIPE)
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exit(0);
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fprintf(stderr, "%s: write error (%s)\n",
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msg, strerror(errno));
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return 0;
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}
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return 1;
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}
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int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
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{
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ssize_t written;
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written = write_in_full(fd, buf, count);
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if (written == 0) {
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fprintf(stderr, "%s: disk full?\n", msg);
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return 0;
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}
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else if (written < 0) {
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fprintf(stderr, "%s: write error (%s)\n",
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msg, strerror(errno));
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return 0;
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}
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return 1;
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}
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