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linux-user: added fake open() for /proc/self/cmdline

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Signed-off-by: Wim Vander Schelden <wim@fixnum.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Wim Vander Schelden 2014-06-18 11:02:39 +02:00 committed by Riku Voipio
parent e8efd8e71f
commit 76b9424550
1 changed files with 46 additions and 0 deletions
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46
linux-user/syscall.c
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@ -4949,6 +4949,51 @@ int host_to_target_waitstatus(int status)
return status;
}
static int open_self_cmdline(void *cpu_env, int fd)
{
int fd_orig = -1;
bool word_skipped = false;
fd_orig = open("/proc/self/cmdline", O_RDONLY);
if (fd_orig < 0) {
return fd_orig;
}
while (true) {
ssize_t nb_read;
char buf[128];
char *cp_buf = buf;
nb_read = read(fd_orig, buf, sizeof(buf));
if (nb_read < 0) {
fd_orig = close(fd_orig);
return -1;
} else if (nb_read == 0) {
break;
}
if (!word_skipped) {
/* Skip the first string, which is the path to qemu-*-static
instead of the actual command. */
cp_buf = memchr(buf, 0, sizeof(buf));
if (cp_buf) {
/* Null byte found, skip one string */
cp_buf++;
nb_read -= cp_buf - buf;
word_skipped = true;
}
}
if (word_skipped) {
if (write(fd, cp_buf, nb_read) != nb_read) {
return -1;
}
}
}
return close(fd_orig);
}
static int open_self_maps(void *cpu_env, int fd)
{
#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32)
@ -5150,6 +5195,7 @@ static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode)
{ "maps", open_self_maps, is_proc_myself },
{ "stat", open_self_stat, is_proc_myself },
{ "auxv", open_self_auxv, is_proc_myself },
{ "cmdline", open_self_cmdline, is_proc_myself },
#if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
{ "/proc/net/route", open_net_route, is_proc },
#endif