[libvirt] [PATCH v4 1/7] pidfile: Make checking binary path in virPidFileRead optional

This patch changes behavior of virPidFileRead to enable passing NULL as path to the binary the pid file should be checked against to skip this check. This enables using this function for reading files that have same semantics as pid files, but belong to unknown processes. --- src/util/virpidfile.c | 21 +++++++++++++-------- 1 files changed, 13 insertions(+), 8 deletions(-) diff --git a/src/util/virpidfile.c b/src/util/virpidfile.c index 1fd6318..f1f721f 100644 --- a/src/util/virpidfile.c +++ b/src/util/virpidfile.c @@ -184,6 +184,9 @@ int virPidFileRead(const char *dir, * resolves to @binpath. This adds protection against * recycling of previously reaped pids. * + * If @binpath is NULL the check for the executable path + * is skipped. + * * Returns -errno upon error, or zero on successful * reading of the pidfile. If the PID was not still * alive, zero will be returned, but @pid will be @@ -209,16 +212,18 @@ int virPidFileReadPathIfAlive(const char *path, } #endif - if (virAsprintf(&procpath, "/proc/%d/exe", *pid) < 0) { - *pid = -1; - return -1; - } + if (binpath) { + if (virAsprintf(&procpath, "/proc/%d/exe", *pid) < 0) { + *pid = -1; + return -1; + } - if (virFileIsLink(procpath) && - virFileLinkPointsTo(procpath, binpath) == 0) - *pid = -1; + if (virFileIsLink(procpath) && + virFileLinkPointsTo(procpath, binpath) == 0) + *pid = -1; - VIR_FREE(procpath); + VIR_FREE(procpath); + } return 0; } -- 1.7.3.4