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[Qemu-devel] [PATCH] linux-user: Consistently return host errnos from do
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH] linux-user: Consistently return host errnos from do_openat() |
Date: |
Thu, 3 Mar 2016 18:36:26 +0000 |
The function do_openat() is not consistent about whether it is
returning a host errno or a guest errno in case of failure.
Standardise on returning -1 with errno set (ie caller has
to call get_errno()).
Signed-off-by: Peter Maydell <address@hidden>
Reported-by: Timothy Edward Baldwin <address@hidden>
---
Timothy's patchset for fixing signal races had a patch which also
addressed this bug. However I preferred to take the opposite tack
and have the callers do get_errno() rather than the callee, because
it means changes in fewer places and it's generally more natural
for the 'fill' functions that do_openat() calls.
---
linux-user/syscall.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index f9dcdd4..39586e4 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -5557,7 +5557,9 @@ static int open_self_cmdline(void *cpu_env, int fd)
nb_read = read(fd_orig, buf, sizeof(buf));
if (nb_read < 0) {
+ int e = errno;
fd_orig = close(fd_orig);
+ errno = e;
return -1;
} else if (nb_read == 0) {
break;
@@ -5577,7 +5579,9 @@ static int open_self_cmdline(void *cpu_env, int fd)
if (word_skipped) {
if (write(fd, cp_buf, nb_read) != nb_read) {
+ int e = errno;
close(fd_orig);
+ errno = e;
return -1;
}
}
@@ -5597,7 +5601,7 @@ static int open_self_maps(void *cpu_env, int fd)
fp = fopen("/proc/self/maps", "r");
if (fp == NULL) {
- return -EACCES;
+ return -1;
}
while ((read = getline(&line, &len, fp)) != -1) {
@@ -5741,7 +5745,7 @@ static int open_net_route(void *cpu_env, int fd)
fp = fopen("/proc/net/route", "r");
if (fp == NULL) {
- return -EACCES;
+ return -1;
}
/* read header */
@@ -5791,7 +5795,7 @@ static int do_openat(void *cpu_env, int dirfd, const char
*pathname, int flags,
if (is_proc_myself(pathname, "exe")) {
int execfd = qemu_getauxval(AT_EXECFD);
- return execfd ? execfd : get_errno(sys_openat(dirfd, exec_path, flags,
mode));
+ return execfd ? execfd : sys_openat(dirfd, exec_path, flags, mode);
}
for (fake_open = fakes; fake_open->filename; fake_open++) {
@@ -5817,7 +5821,9 @@ static int do_openat(void *cpu_env, int dirfd, const char
*pathname, int flags,
unlink(filename);
if ((r = fake_open->fill(cpu_env, fd))) {
+ int e = errno;
close(fd);
+ errno = e;
return r;
}
lseek(fd, 0, SEEK_SET);
@@ -5825,7 +5831,7 @@ static int do_openat(void *cpu_env, int dirfd, const char
*pathname, int flags,
return fd;
}
- return get_errno(sys_openat(dirfd, path(pathname), flags, mode));
+ return sys_openat(dirfd, path(pathname), flags, mode);
}
#define TIMER_MAGIC 0x0caf0000
--
1.9.1
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