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author | jhb <jhb@FreeBSD.org> | 2013-05-03 21:11:57 +0000 |
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committer | jhb <jhb@FreeBSD.org> | 2013-05-03 21:11:57 +0000 |
commit | 679fa5ed4e91b1d9e2002d8da43d9c31056fe7a4 (patch) | |
tree | 4b4ec8c6d14c8986e2139b96edf75a870d996980 /lib/libprocstat | |
parent | 66bb8e0f75e5284e0b64916ea8295efb5ca1fff6 (diff) | |
download | FreeBSD-src-679fa5ed4e91b1d9e2002d8da43d9c31056fe7a4.zip FreeBSD-src-679fa5ed4e91b1d9e2002d8da43d9c31056fe7a4.tar.gz |
Similar to 233760 and 236717, export some more useful info about the
kernel-based POSIX semaphore descriptors to userland via procstat(1) and
fstat(1):
- Change sem file descriptors to track the pathname they are associated
with and add a ksem_info() method to copy the path out to a
caller-supplied buffer.
- Use the fo_stat() method of shared memory objects and ksem_info() to
export the path, mode, and value of a semaphore via struct kinfo_file.
- Add a struct semstat to the libprocstat(3) interface along with a
procstat_get_sem_info() to export the mode and value of a semaphore.
- Teach fstat about semaphores and to display their path, mode, and value.
MFC after: 2 weeks
Diffstat (limited to 'lib/libprocstat')
-rw-r--r-- | lib/libprocstat/Symbol.map | 1 | ||||
-rw-r--r-- | lib/libprocstat/libprocstat.3 | 14 | ||||
-rw-r--r-- | lib/libprocstat/libprocstat.c | 90 | ||||
-rw-r--r-- | lib/libprocstat/libprocstat.h | 6 |
4 files changed, 110 insertions, 1 deletions
diff --git a/lib/libprocstat/Symbol.map b/lib/libprocstat/Symbol.map index 085720c..1495bfc 100644 --- a/lib/libprocstat/Symbol.map +++ b/lib/libprocstat/Symbol.map @@ -22,6 +22,7 @@ FBSD_1.3 { procstat_freegroups; procstat_freekstack; procstat_freevmmap; + procstat_get_sem_info; procstat_get_shm_info; procstat_getargv; procstat_getauxv; diff --git a/lib/libprocstat/libprocstat.3 b/lib/libprocstat/libprocstat.3 index 3312427..e82c30a 100644 --- a/lib/libprocstat/libprocstat.3 +++ b/lib/libprocstat/libprocstat.3 @@ -53,6 +53,7 @@ .Nm procstat_freevmmap , .Nm procstat_get_pipe_info , .Nm procstat_get_pts_info , +.Nm procstat_get_sem_info , .Nm procstat_get_shm_info , .Nm procstat_get_socket_info , .Nm procstat_get_vnode_info @@ -115,6 +116,13 @@ .Fa "char *errbuf" .Fc .Ft int +.Fo procstat_get_sem_info +.Fa "struct procstat *procstat" +.Fa "struct filestat *fst" +.Fa "struct semstat *sem" +.Fa "char *errbuf" +.Fc +.Ft int .Fo procstat_get_shm_info .Fa "struct procstat *procstat" .Fa "struct filestat *fst" @@ -463,12 +471,13 @@ function call. The .Fn procstat_get_pipe_info , .Fn procstat_get_pts_info , +.Fn procstat_get_sem_info , .Fn procstat_get_shm_info , .Fn procstat_get_socket_info and .Fn procstat_get_vnode_info functions are used to retrieve information about pipes, pseudo-terminals, -shared memory objects, +semaphores, shared memory objects, sockets, and vnodes, respectively. Each of them have a similar interface API. The @@ -505,6 +514,8 @@ argument indicates an actual error message in case of failure. .Nm procstat_get_pipe_info .It Li PS_FST_TYPE_PTS .Nm procstat_get_pts_info +.It Li PS_FST_TYPE_SEM +.Nm procstat_get_sem_info .It Li PS_FST_TYPE_SHM .Nm procstat_get_shm_info .El @@ -517,6 +528,7 @@ argument indicates an actual error message in case of failure. .Xr elf 3 , .Xr kvm 3 , .Xr queue 3 , +.Xr sem_open 3 , .Xr sysctl 3 , .Xr pts 4 , .Xr core 5 , diff --git a/lib/libprocstat/libprocstat.c b/lib/libprocstat/libprocstat.c index dd16c80..78eae9f 100644 --- a/lib/libprocstat/libprocstat.c +++ b/lib/libprocstat/libprocstat.c @@ -59,6 +59,7 @@ __FBSDID("$FreeBSD$"); #define _WANT_FILE #include <sys/file.h> #include <sys/conf.h> +#include <sys/ksem.h> #include <sys/mman.h> #define _KERNEL #include <sys/mount.h> @@ -129,6 +130,10 @@ static int procstat_get_pts_info_sysctl(struct filestat *fst, struct ptsstat *pts, char *errbuf); static int procstat_get_pts_info_kvm(kvm_t *kd, struct filestat *fst, struct ptsstat *pts, char *errbuf); +static int procstat_get_sem_info_sysctl(struct filestat *fst, + struct semstat *sem, char *errbuf); +static int procstat_get_sem_info_kvm(kvm_t *kd, struct filestat *fst, + struct semstat *sem, char *errbuf); static int procstat_get_shm_info_sysctl(struct filestat *fst, struct shmstat *shm, char *errbuf); static int procstat_get_shm_info_kvm(kvm_t *kd, struct filestat *fst, @@ -556,6 +561,10 @@ procstat_getfiles_kvm(struct procstat *procstat, struct kinfo_proc *kp, int mmap data = file.f_data; break; #endif + case DTYPE_SEM: + type = PS_FST_TYPE_SEM; + data = file.f_data; + break; case DTYPE_SHM: type = PS_FST_TYPE_SHM; data = file.f_data; @@ -1003,6 +1012,87 @@ procstat_get_pts_info_sysctl(struct filestat *fst, struct ptsstat *pts, } int +procstat_get_sem_info(struct procstat *procstat, struct filestat *fst, + struct semstat *sem, char *errbuf) +{ + + assert(sem); + if (procstat->type == PROCSTAT_KVM) { + return (procstat_get_sem_info_kvm(procstat->kd, fst, sem, + errbuf)); + } else if (procstat->type == PROCSTAT_SYSCTL || + procstat->type == PROCSTAT_CORE) { + return (procstat_get_sem_info_sysctl(fst, sem, errbuf)); + } else { + warnx("unknown access method: %d", procstat->type); + snprintf(errbuf, _POSIX2_LINE_MAX, "error"); + return (1); + } +} + +static int +procstat_get_sem_info_kvm(kvm_t *kd, struct filestat *fst, + struct semstat *sem, char *errbuf) +{ + struct ksem ksem; + void *ksemp; + char *path; + int i; + + assert(kd); + assert(sem); + assert(fst); + bzero(sem, sizeof(*sem)); + ksemp = fst->fs_typedep; + if (ksemp == NULL) + goto fail; + if (!kvm_read_all(kd, (unsigned long)ksemp, &ksem, + sizeof(struct ksem))) { + warnx("can't read ksem at %p", (void *)ksemp); + goto fail; + } + sem->mode = S_IFREG | ksem.ks_mode; + sem->value = ksem.ks_value; + if (fst->fs_path == NULL && ksem.ks_path != NULL) { + path = malloc(MAXPATHLEN); + for (i = 0; i < MAXPATHLEN - 1; i++) { + if (!kvm_read_all(kd, (unsigned long)ksem.ks_path + i, + path + i, 1)) + break; + if (path[i] == '\0') + break; + } + path[i] = '\0'; + if (i == 0) + free(path); + else + fst->fs_path = path; + } + return (0); + +fail: + snprintf(errbuf, _POSIX2_LINE_MAX, "error"); + return (1); +} + +static int +procstat_get_sem_info_sysctl(struct filestat *fst, struct semstat *sem, + char *errbuf __unused) +{ + struct kinfo_file *kif; + + assert(sem); + assert(fst); + bzero(sem, sizeof(*sem)); + kif = fst->fs_typedep; + if (kif == NULL) + return (0); + sem->value = kif->kf_un.kf_sem.kf_sem_value; + sem->mode = kif->kf_un.kf_sem.kf_sem_mode; + return (0); +} + +int procstat_get_shm_info(struct procstat *procstat, struct filestat *fst, struct shmstat *shm, char *errbuf) { diff --git a/lib/libprocstat/libprocstat.h b/lib/libprocstat/libprocstat.h index 2c2662d..65a5eb9 100644 --- a/lib/libprocstat/libprocstat.h +++ b/lib/libprocstat/libprocstat.h @@ -133,6 +133,10 @@ struct pipestat { uint64_t addr; uint64_t peer; }; +struct semstat { + uint32_t value; + uint16_t mode; +}; struct shmstat { uint64_t size; uint16_t mode; @@ -177,6 +181,8 @@ int procstat_get_pipe_info(struct procstat *procstat, struct filestat *fst, struct pipestat *pipe, char *errbuf); int procstat_get_pts_info(struct procstat *procstat, struct filestat *fst, struct ptsstat *pts, char *errbuf); +int procstat_get_sem_info(struct procstat *procstat, struct filestat *fst, + struct semstat *sem, char *errbuf); int procstat_get_shm_info(struct procstat *procstat, struct filestat *fst, struct shmstat *shm, char *errbuf); int procstat_get_socket_info(struct procstat *procstat, struct filestat *fst, |