diff options
Diffstat (limited to 'os-posix.c')
| -rw-r--r-- | os-posix.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/os-posix.c b/os-posix.c index 01dbec2e36..621ad062b0 100644 --- a/os-posix.c +++ b/os-posix.c @@ -28,6 +28,7 @@ #include <signal.h> #include <sys/types.h> #include <sys/wait.h> +#include <libgen.h> /* Needed early for CONFIG_BSD etc. */ #include "config-host.h" @@ -66,3 +67,66 @@ void os_setup_signal_handling(void) act.sa_flags = SA_NOCLDSTOP; sigaction(SIGCHLD, &act, NULL); } + +/* Find a likely location for support files using the location of the binary. + For installed binaries this will be "$bindir/../share/qemu". When + running from the build tree this will be "$bindir/../pc-bios". */ +#define SHARE_SUFFIX "/share/qemu" +#define BUILD_SUFFIX "/pc-bios" +char *os_find_datadir(const char *argv0) +{ + char *dir; + char *p = NULL; + char *res; + char buf[PATH_MAX]; + size_t max_len; + +#if defined(__linux__) + { + int len; + len = readlink("/proc/self/exe", buf, sizeof(buf) - 1); + if (len > 0) { + buf[len] = 0; + p = buf; + } + } +#elif defined(__FreeBSD__) + { + static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; + size_t len = sizeof(buf) - 1; + + *buf = '\0'; + if (!sysctl(mib, sizeof(mib)/sizeof(*mib), buf, &len, NULL, 0) && + *buf) { + buf[sizeof(buf) - 1] = '\0'; + p = buf; + } + } +#endif + /* If we don't have any way of figuring out the actual executable + location then try argv[0]. */ + if (!p) { + p = realpath(argv0, buf); + if (!p) { + return NULL; + } + } + dir = dirname(p); + dir = dirname(dir); + + max_len = strlen(dir) + + MAX(strlen(SHARE_SUFFIX), strlen(BUILD_SUFFIX)) + 1; + res = qemu_mallocz(max_len); + snprintf(res, max_len, "%s%s", dir, SHARE_SUFFIX); + if (access(res, R_OK)) { + snprintf(res, max_len, "%s%s", dir, BUILD_SUFFIX); + if (access(res, R_OK)) { + qemu_free(res); + res = NULL; + } + } + + return res; +} +#undef SHARE_SUFFIX +#undef BUILD_SUFFIX |