From a40f520f7b94d2a5de04c7ca3a7513a99c84e9ef Mon Sep 17 00:00:00 2001

From: Justin M. Forbes <jforbes@redhat.com>

Date: Thu, 1 Oct 2009 16:13:56 -0500

Subject: [PATCH] Improve error reporting on file access

By making the error reporting include strerror(errno), it gives the user

a bit more indication as to why qemu failed.  This is particularly

important for people running qemu as a non root user.

Signed-off-by: Justin M. Forbes <jforbes@redhat.com>

---

 hw/pc.c |   12 ++++++------

 vl.c    |   20 ++++++++++----------

 2 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c

index 3b226f4..7a184cd 100644

--- a/hw/pc.c

+++ b/hw/pc.c

@@ -841,8 +841,8 @@ static void load_linux(void *fw_cfg,

     if (!f || !(kernel_size = get_file_size(f)) ||

 	fread(header, 1, MIN(ARRAY_SIZE(header), kernel_size), f) !=

 	MIN(ARRAY_SIZE(header), kernel_size)) {

-	fprintf(stderr, "qemu: could not load kernel '%s'\n",

-		kernel_filename);

+	fprintf(stderr, "qemu: could not load kernel '%s': %s\n",

+		kernel_filename, strerror(errno));

 	exit(1);

     }

@@ -947,8 +947,8 @@ static void load_linux(void *fw_cfg,

 	fi = fopen(initrd_filename, "rb");

 	if (!fi) {

-	    fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",

-		    initrd_filename);

+	    fprintf(stderr, "qemu: could not load initial ram disk '%s': %s\n",

+		    initrd_filename, strerror(errno));

 	    exit(1);

 	}

@@ -956,8 +956,8 @@ static void load_linux(void *fw_cfg,

 	initrd_addr = (initrd_max-initrd_size) & ~4095;

 	if (!fread_targphys_ok(initrd_addr, initrd_size, fi)) {

-	    fprintf(stderr, "qemu: read error on initial ram disk '%s'\n",

-		    initrd_filename);

+	    fprintf(stderr, "qemu: read error on initial ram disk '%s': %s\n",

+		    initrd_filename, strerror(errno));

 	    exit(1);

 	}

 	fclose(fi);

diff --git a/vl.c b/vl.c

index d7c7ab1..9182d89 100644

--- a/vl.c

+++ b/vl.c

@@ -2379,8 +2379,8 @@ int drive_init(struct drive_opt *arg, int snapshot, void *opaque)

     else if (cache == 2) /* write-back */

         bdrv_flags |= BDRV_O_CACHE_WB;

     if (bdrv_open2(bdrv, file, bdrv_flags, drv) < 0) {

-        fprintf(stderr, "qemu: could not open disk image %s\n",

-                        file);

+        fprintf(stderr, "qemu: could not open disk image %s: %s\n",

+                        file, strerror(errno));

         return -1;

     }

     if (bdrv_key_required(bdrv))

@@ -5799,7 +5799,7 @@ int main(int argc, char **argv, char **envp)

             if (len != 1)

                 exit(1);

             else if (status == 1) {

-                fprintf(stderr, "Could not acquire pidfile\n");

+                fprintf(stderr, "Could not acquire pidfile: %s\n", strerror(errno));

                 exit(1);

             } else

                 exit(0);

@@ -5826,7 +5826,7 @@ int main(int argc, char **argv, char **envp)

             uint8_t status = 1;

             write(fds[1], &status, 1);

         } else

-            fprintf(stderr, "Could not acquire pid file\n");

+            fprintf(stderr, "Could not acquire pid file: %s\n", strerror(errno));

         exit(1);

     }

 #endif

@@ -6031,8 +6031,8 @@ int main(int argc, char **argv, char **envp)

             snprintf(label, sizeof(label), "serial%d", i);

             serial_hds[i] = qemu_chr_open(label, devname, NULL);

             if (!serial_hds[i]) {

-                fprintf(stderr, "qemu: could not open serial device '%s'\n",

-                        devname);

+                fprintf(stderr, "qemu: could not open serial device '%s': %s\n",

+                        devname, strerror(errno));

                 exit(1);

             }

         }

@@ -6045,8 +6045,8 @@ int main(int argc, char **argv, char **envp)

             snprintf(label, sizeof(label), "parallel%d", i);

             parallel_hds[i] = qemu_chr_open(label, devname, NULL);

             if (!parallel_hds[i]) {

-                fprintf(stderr, "qemu: could not open parallel device '%s'\n",

-                        devname);

+                fprintf(stderr, "qemu: could not open parallel device '%s': %s\n",

+                        devname, strerror(errno));

                 exit(1);

             }

         }

@@ -6059,8 +6059,8 @@ int main(int argc, char **argv, char **envp)

             snprintf(label, sizeof(label), "virtcon%d", i);

             virtcon_hds[i] = qemu_chr_open(label, devname, NULL);

             if (!virtcon_hds[i]) {

-                fprintf(stderr, "qemu: could not open virtio console '%s'\n",

-                        devname);

+                fprintf(stderr, "qemu: could not open virtio console '%s': %s\n",

+                        devname, strerror(errno));

                 exit(1);

             }

         }

-- 

1.6.2.5