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| author |   Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2006-02-24 13:03:57 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-24 14:31:37 -0800 |
| commit | f462e8f913bdc7a28ce55508d0c045a0c445b157 (patch) | |
| tree | ce584e748f632d90307d3c2cd62294f3b209c903 /arch/um/drivers | |
| parent | [PATCH] uml: os_connect_socket error path fixup (diff) | |
| download | linux-dev-f462e8f913bdc7a28ce55508d0c045a0c445b157.tar.xz linux-dev-f462e8f913bdc7a28ce55508d0c045a0c445b157.zip | |
[PATCH] uml: better error reporting for read_output
Do precise error handling: print precise error messages, distinguishing short
reads and read errors. This functions fails frequently enough for me so I
bothered doing this fix.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/drivers')
| -rw-r--r-- | arch/um/drivers/net_user.c | 34 |
1 files changed, 22 insertions, 12 deletions
diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c index 098fa65981ab..0e2f06187ea7 100644 --- a/arch/um/drivers/net_user.c +++ b/arch/um/drivers/net_user.c @@ -47,10 +47,12 @@ void tap_check_ips(char *gate_addr, unsigned char *eth_addr) } } +/* Do reliable error handling as this fails frequently enough. */ void read_output(int fd, char *output, int len) { - int remain, n, actual; + int remain, ret, expected; char c; + char *str; if(output == NULL){ output = &c; @@ -58,23 +60,31 @@ void read_output(int fd, char *output, int len) } *output = '\0'; - n = os_read_file(fd, &remain, sizeof(remain)); - if(n != sizeof(remain)){ - printk("read_output - read of length failed, err = %d\n", -n); - return; + ret = os_read_file(fd, &remain, sizeof(remain)); + + if (ret != sizeof(remain)) { + expected = sizeof(remain); + str = "length"; + goto err; } while(remain != 0){ - n = (remain < len) ? remain : len; - actual = os_read_file(fd, output, n); - if(actual != n){ - printk("read_output - read of data failed, " - "err = %d\n", -actual); - return; + expected = (remain < len) ? remain : len; + ret = os_read_file(fd, output, expected); + if (ret != expected) { + str = "data"; + goto err; } - remain -= actual; + remain -= ret; } + return; + +err: + if (ret < 0) + printk("read_output - read of %s failed, errno = %d\n", str, -ret); + else + printk("read_output - read of %s failed, read only %d of %d bytes\n", str, ret, expected); } int net_read(int fd, void *buf, int len) |