Commit 76b94245 authored by Wim Vander Schelden's avatar Wim Vander Schelden Committed by Riku Voipio
Browse files

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



Signed-off-by: default avatarWim Vander Schelden <wim@fixnum.org>
Signed-off-by: default avatarRiku Voipio <riku.voipio@linaro.org>
parent e8efd8e7

linux-user/syscall.c

+46 −0
Original line number Diff line number Diff line
@@ -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